Unit5FirstaidReading解读
(完整版)Unit 5 First aid课文讲解
Unit 5 First aidReadingFIRST AID FOR BURNSThe skin is an essential part of your body and its largest organ。
You have three layers of skin which act as a barrier against disease,poisons and the sun’s harmful rays. The functions of your skin are also very complex: it keeps you warm or cool; it prevents your body from losing too much water; it is where you feel cold, heat or pain and it gives you your sense of touch。
So as you can imagine, if your skin gets burned it can be very serious。
First aid is a very important first step in the treatment of bums。
烧伤的急救皮肤是身体必不可少的部分,也是身体的最大器官.皮肤有三层,它们是防病、防毒、抵御太阳有害光线侵害的一道屏障。
皮肤的功能十分复杂。
皮肤可以保暖或御寒,保持体内水分。
正是皮肤使你感到冷热、疼痛,它还使你有触觉.因此,你可以想象到,如果你的皮肤烧伤了,就可能非常严重。
在治疗烧伤的过程中,紧急处理是非常重要的第一步。
Causes of burnsYou can get burned by a variety of things: hot liquids, steam, fire, radiation (by being close to high heat or fire, etc), the sun, electricity or chemicals。
新人教高中英语选择性必修二Unit5First Aid单元分析
Unit 5 FIRST AID单元分析单元主题:人与社会——急救单元内容分析本单元主题是人与社会,围绕“急救”这一话题展开。
急救是指在伤病突然发生时,利用当时环境中的一切设备和材料,按照一定的原则立即加以处理的行为。
在将伤者交给医生或送到医院以前,急救可以使伤病者维持生命,防止伤势和病情进一步恶化。
急救技能是一项必备的生活技能。
本单元旨在帮助学生掌握急救知识和技能,并了解遇到紧急情况时应向谁求救、如何有效求助,这样有助于培养他们应对突发事件和意外伤害的能力,以便他们能在未来面对类似情况时迅速反应,有效实施自救和互救。
通过本单元的学习,学生不仅能提高安全意识和自我保护能力,还能深刻理解生命的意义和珍爱生命的重要性,学会关爱他人,传递友爱。
以下为教材各部分教学内容的简要分析及教学活动的实施建议:1.本单元的引言为“It's a great honour to save a life.”,可以译为:救人一命,善莫大焉。
这句话体现了施救者的仁爱之心。
本单元不仅仅是向学生传授有关急救的基本知识,还要培养学生的仁爱之心,使学生认识到通过自己的努力挽救生命是一件光荣的事情,更是人道主义、博爱和奉献精神的体现。
本单元的主题图呈现的是急救培训的现场,培训内容为心肺复苏的操作。
片刻间能危及生命的是心跳、呼吸的骤停。
在日常生活中,造成心跳、呼吸骤停最常见的原因是心脏急症,其他原因还包括触电、溺水、中毒等急症,此时黄金抢救时间只有四分钟。
处理心跳、呼吸骤停的方法即为心肺复苏法(即CPR,包括胸外按压、开放气道、人工呼吸等一系列操作)。
急救教育应从学生抓起,学习急救知识有助于学生树立安全意识。
普及基本的急救护理知识也是提升公民素质的一个重要方面。
2.Reading and Thinking:Learn about first aid for burns主课文是医院宣传单上的一篇文章,其目的是向人们宣传正确的烧伤、烫伤和灼伤急救方法。
Unit-5 first aid- reading
r t there ? 2.What can skin do for our body? (Para1
e a
① act as a barrier against diseases, poisons and the sun’s harmful rays
fire chemica8ls
Types & characteristics of burns
(based on page 34)
First 1. TypAefsfect the
degree
burns
top______
oflathyeerskin.
Dry, red 2._C__h_a_ra_c_terTiusrtnicws hite
Part 3:Types of burns
Part 4: Characteristics of burns
First aid for burns
Part 5:First aid treatment
3
Fa s rt
e a
d i gn
Skimming:
Skim the subtitles and put the following statements in right order.
red and painful. watery
swollen.
surface
Third degree burns
Affect_a_l_l __ Swollen;
_t_h_r_e_e___
layers of
______
tciasnsue
the skin.
be seen.
Unit 5 First aid Reading解读
Review
How much do you know about First Aid ?
Are you familiar with the following numb
110 Police department 119 Fire department 120 Emergency(急救) centre
and fill in the blaSnckansn. ing
The skin is an essential part of your body
and its
organ.
You have layers of skin.
Skin protects you against
, poisons
and the sun's harmful rays.
Lead-in Brainstorming:
What words can you think of when you talk about first aid?
ambulance
First aid
…
ambulance
Reading First Aid foBr urns
Teaching goals教学目标
It also keeps you warmor cool; it prevents your body from losingtoo much water; it is where you feel cold , heat or pain and it gives you your sense of touch.
Part2. Causes of burns
Part3. Types of burns
Part4 Characteristics of burns
新人教必修五Unit5FirstAidReading课件讲解学习
Part 1
A.Causes of burns
Part 2
B.The functions of skin
Part 3
C.First aid treatment
Part 4 Part 5
D.Characteristics of burns E.Types of burns
Scan Part 1 to 4 to answer three questions
Summing up
New words
Content
burned, swollen, hot liquids, blisters, scissors, bandage
Functions of skin Causes of burns
It keeps ... It prevents... It is where… It gives...
新人教必修五 Unit5FirstAidReading课件
What happened to my finger?
burned
bandage
finger
hot liquids
scissors
blisters swollen
Skim the text and match main idea with each part
Remove
clothing
Get
victim
Cool
burns
Place
cloths
Cover
bandage
Dry
burned area
Practise 6 steps about first aid for burns
1. RReemmoovvee clothing using scissors if necessary 2. Cool burns with cool water for 10 minutes 3. PPllaaccee cool, clean, wet cloths on burns 4. Dry the burned area gently 5. CCoovveerr the burned area with a dry, clean bandage 6. Get the victim to the hospital if serious
Unit 5 First aid课文讲解
U n i t5F i r s t a i d ReadingFIRSTAIDFORBURNS Theskinisanessentialpartofyourbodyanditslargestorgan.Youhavethreelayersofski nwhichactasabarrieragainstdisease,poisonsandthesun'sharmfulrays.Thefunction sofyourskinarealsoverycomplex:itkeepsyouwarmorcool;itpreventsyourbodyfrom losingtoomuchwater;itiswhereyoufeelcold,heatorpainanditgivesyouyoursenseofto uch.Soasyoucanimagine,ifyourskingetsburneditcanbeveryserious.Firstaidisaveryi mportantfirststepinthetreatmentofbums.烧伤的急救皮肤是身体必不可少的部分,也是身体的最大器官。
皮肤有三层,它们是防病、防毒、抵御太阳有害光线侵害的一道屏障。
皮肤的功能十分复杂。
皮肤可以保暖或御寒,保持体内水分。
正是皮肤使你感到冷热、疼痛,它还使你有触觉。
因此,你可以想象到,如果你的皮肤烧伤了,就可能非常严重。
在治疗烧伤的过程中,紧急处理是非常重要的第一步。
CausesofburnsYoucangetburnedbyavarietyofthings:hotliquids,steam,fire,radiation(bybeingcl osetohighheatorfire,etc),thesun,electricityorchemicals.TypesofburnsTherearethreetypesofburns.Burnsarecalledfirst,secondorthirddegreeburns,de pendingonwhichlayersoftheskinareburned.◎FirstdegreeburnsTheseaffectonlythetoplayeroftheskin.Theseburnsarenotser iousandshouldfeelbetterwithinadayortwo.Examplesincludemildsunburnand burnscausedbytouchingahotpan,stoveorironforamordent.◎SeconddegreeburnsTheseaffectboththetopandthesecondlayeroftheskin.Thes ebumsareseriousandtakeafewweekstoheal.Examplesincludeseveresunburna ndbumscausedbyhotliquids.◎ThirddegreeburnsTheseaffectallthreelayersoftheskinandanytissueandorgan sundertheskin.Examplesincludeburnscausedbyelectricshocks,burningclothe s,orseverepetrolfires.Theseburnscauseverysevereinjuriesandthevictimmustg otohospitalatonce.烧伤的原因:你可能由于各种原因而烧伤:灼热的液体、水蒸气、火、辐射(由于靠近高温或大火)、阳光、电和化学物品。
高二英语必修五unit5_first_aid_精品课件Reading部分
Emergency medical service
119 Fire department
110 Police depart Aid
Warming Up
Aims
1.Sudents can master the words and expressions. first aid; bleed; blood;chock skin; and so on.
2. Students will be able to talk about different accidents.
Be careful not to eat too fast . Don’t go camping alone. Look out for the dangerous animals. Watch out for… Make sure that.. Never…
Important numbers
120
3.Students will be able to know how to give first aid in time.
First aid is the help given to someone who suddenly __fa_l_ls_i_ll_ or _g_et_s_i_n_ju_r_e_d before a doctor can be found. Often the _il_ln_e_s_s or _in_j_u_r_y_ is not_s_er_i_o_u_s _, but there are other times when giving __fi_rs_t_a_id__q_u_ic_k_l_y_will save _l_iv_e_s____ .
a snake bite
Unit 5 First aid重难点解析
高二必修5 Unit 5 First aid重难点解析Unit5 First Aid 重点、难点及考点解析一、重点单词1. treatment ①不可数名词“对待, 待遇,处理; 治疗The workers received good treatment from the government.工人们受到政府优厚的待遇.②可数名词“疗法”They are trying a new treatment for cancer.知识拓展be under treatment 在治疗中be under one’s treatment 接受某人的治疗for treatment 进行治疗treatment for + 疾病的名词治…病的方法2. sensesense of touch 触觉sense of sight 视觉sense of hearing 听觉sense of taste 味觉sense of smell 嗅觉sense of humor 幽默感sense of beauty 美感sense of direction 方向感sense of honor 荣誉感sense of values 价值观sense of justice 正义感sense of hunger 饥饿感sense of responsibility 责任感the sixth sense 第六感make sense 有道理;讲得通2.present n.礼物,目前adj.在场,出席,当前的v.颁发,授予,赠给present sth. to sb. 授予/赠给某人某物present sb. with sth 授予/赠给某人某物at present 目前;现在for the present 暂时;暂且be present at 出席;到场3.dress v.敷裹,包扎E.g. Immediately after his wound was dressed, he went to work.知识拓展dress sb. /oneself 给…穿衣服be dressed in 穿着….. (颜色)dress up (as) 盛装打扮( 成….. )1. Tom had to return to the camp to_____ his injuries.2. _______white/a white coat, Mary went to the party.3. We _________to take part in the party.Key: 1 dress 2. Dressed in 3. dressed up4. swell v. 膨胀,隆起Her leg has swollen badly.她的腿肿得很厉害The wind swelled the sails.风鼓起了帆二、重点短语1、first aid “急救”知识拓展give/offer aid 援助come to sb.'s aid 帮助某人cut off aid (突然)终止援助 a hearing aid 助听器teaching aids 教具medical aid 医疗救护with the aid of 借助于2、get injured 受伤get done结构相当于be done强调状态The computer got (was) damaged when we were moving. 我们搬家的时候,电脑碰坏了My bike is getting (is being) repaired now. 我的自行车正在修理My glasses got broken while I was playing basket-ball. 我的眼镜在打篮球时给弄坏了—Where have you been these days?—My leg____in an accident, and I just return home from hospital.A gets injuredB is injuredC got injuredD injuredKey: C3、protect sb./sth. against/from sth. 保护…..免受…..He is wearing sunglasses to protect his eyes from the strong sunlight. 他带着太阳镜以挡强烈的阳光知识拓展keep... from doing 阻止….做某事prevent/stop... (from) doing 妨碍/阻止…做某事在be prevented/stopped from doing 结构中,介词from 能省略吗?不能如:We are prevented/stopped from going there.4、depend on/upon依靠,依赖,相信,取决于depend on/upon +wh-从句视….而定,取决于depend on/ upon+ n 依靠,依赖,相信depend on/upon+sb.+to do 指望某人做……depend on/upon +it +that…. 指望…..That (all) depends. / It all depends. (口语)视情况而定,单独使用或置于句首Translate the following sentences into English.①、你不能永远依赖你的父母②、你不能指望他能按时来③、你可相信他会来④、我能帮你,但那要看情况而定⑤、这要取决于你是否到这儿Key: ①You can’t depend on your parents forever.②You can’t depend on him to come on time.③You may depend on it that he will come.④I may help you. But that/ it depends.⑤It depends on /upon whether you come here or not.5.squeeze out 榨出,挤出They have been squeezed out of the job market by young people.他们被年轻人挤出了就业市场知识拓展squeeze money from sb 向某人勒索钱财squeeze money out of sb ;, 向某人勒索钱财The young man often squeezes money from/out of the pupil.那个年轻人经常向那个小学生勒索钱财6. over and over againover and over again = again and again, 一再,再三,许多次I’ve told you over and over aga in not to do that.我再三告诫你不要那样做7.in place 放在适当的地方You’d better put things back in place. Otherwise, it will be difficult to find things. 你最好把你的东西各就各位,不然很难找知识拓展in place 在适当的位置,适当out of place 不在适当的位置,不适当in place of 代替take the place of 代替8. p ut one’s hand(s) on常用于否定句、疑问句或条件从句中,意为“找到,得到”eg, I’m afraid I can’t put my hand(s) on the book you want.恐怕我一时找不到你想要的那本书9. make a (some/no/any/not much/a great deal of) difference有(一些/没有/任何/不太大的/很大的) 差别tell the difference between 辨别两者的差别It makes no difference/doesn‘t make any difference to me whether you come here or not.对我来说,你来不来都无所谓三、重点句型1. Take clothing off the burned area unless it is stuck to the burn.unless 作从属连词,引导条件状语从句,作“除非…..否则”讲,相当于if…not注意①在unless引导的从句里,谓语用一般现在时,不用一般将来时②在引导的从句里,当主语与从句主语是同一人或物,且有系动词时,从句主语与系动词可省略E.g. I will not attend the meeting unless (I am) invited.I won’t call you, ________ something unexpected happens.A. unlessB. whetherC. becauseD. whileKey: A2. John was studying in his room when he heard screaming.此句型中when作并列连词相当于and then意为”正当……时突然”,常用于以下句型:知识拓展be doing …when…正在做……突然be about to do …when…即将做……突然be on the point to do…when…正要去做…..突然has/have/had done…when…刚刚……这时(突然)3. There is no doubt that John's quick thinking and the first aid skills that he learned at school saved Ms Slade's life.doubt 名词,意思是“怀疑”、“疑惑”、“疑问”如:I have no doubt at all who did it.知识拓展:There is no doubt that…/about sth. 毫无疑问……(肯定句)主语+doubt whether/ is…(否定句)主语+not doubt that 从句I don’t doubt t hat his words are true.There is some doubt whether John will come.4. It was John’s quick action and knowledge of the first aid that saved her life.本句为强调句型结构,符合It is/was…that... 结构强调句型It is/was…that/who 的用法归纳如下:强调句型可以强调除谓语动词以外的任何句子成份一般来说,如果被强调部分是人时,用连词that或who;如果被强调部分是物,只能用连词that强调句型应避免使用when, where, which 等连词含一般疑问句和特殊疑问句的强调句句型:①含一般疑问句的强调句型,其结构为:Is it+被强调部分+that/who+句子的其余部分?②特殊疑问句的强调句型结构形式为:特殊疑问词+is/was it that/who+句子的其余部分?四、疑难辨析1、wound, injure, harm 与hurt:wound 一般指外伤,如枪伤,刀伤等,尤指在战场上受伤;也可指在感情上荣誉方面的创伤injure 常指因意外或事故而造成的损伤,还可表示在感情上,荣誉上的伤害,可用于人或物harm 指损害有生命的或无生命的东西;也可指肉体上或精神上的损害hurt 指任何肉体或精神上的伤害尤其指打伤,刺伤;还可表示“疼痛”2、damage, destroy 和ruindamage “损坏”, 意味着损坏后的价值或效率降低,一般是部分性的destroy 指十分彻底地“破坏”,含有不能或很难修复的意思ruin 指某物被损害到不能再修复,不能再使用的程度。
UNIT5 FIRST AID(单元解读课件)(人教版2019选择性必修第二册)
陈伟运用海姆利希式急救法 救人的事迹
(人与社会)弘扬见义勇为的 行为,体现人道主义精神,传 递真情。
英国一男孩拨打999急救热线 (人与社会)急救电话是生命
时与接线员的对话
热线,挽救生命刻不容缓,生
命诚可贵。
介绍化学药品灼伤的成因、伤 (人与社会)急救的
害和急救措施
意义
一位独居老人的心脏病发作 (人与社会)老年人
The story of Nancy getting injured
名人名言 (阅读)
医院宣传单 (说明文阅读)
杂志文章 (阅读)
对话 (听力)
杂志文章 (说明文)
杂志文章 (记叙文阅读)
杂志文章(记叙文阅读)
救人一命,善莫大焉。
生命诚可贵,挽救生 命,传递真情。
了解日常生活的烧烫/灼伤的 (人与自我)用急救 知识和如何正确处理这些情况 知识挽救人的生命,
why
学生学习皮肤烧烫伤的相关急救知识,这能够帮助学生增强现 实生活中自救与救人的意识和能力,教会学生在面临紧急状况 时要善于分析和应对,积极运用所学知识迅速进行判断并实施 有效的急救措施,帮助自己或他人脱离危险,减轻伤害程度, 树立学生的安全防范意 识。
how
全文围绕“烧烫伤”这一关键词展开,可分为五个部分,篇章结构为“总一分”。 第一部分阐释作为人体重要器官皮肤的不可替代性,说明烧烫伤会导致皮肤不同程度 受损,应针对皮肤烧烫伤立即采取相应的急救措施;第二部分说明引起烧烫伤的原因 是多种多样的,提醒读者在生活中处理可能引起烧烫伤的物品时应小心谨慎;第三部 分说明按照皮肤受损程度和烧烫伤的深度,可把烧烫伤分为一度、二度和三度等几种 类型;第四部分针对不同等级的烧烫伤进行特征描述,这有助于读者根据伤口外观用 肉眼判断烧烫伤的严重程度及类型;第五部分点出主题,指导读者采取正确的急救措 施处理皮肤烧烫伤。
高中英语选修二Unit 5 First Aid Reading and Thinking阅读段分讲解
control your body temperature, prevents your body from losing too much water,
warns you when things are too hot or cold, and gives you your sense of touch.
a variety of 意为“各种各样的” ,相当于varieties of。 可修饰可数也可修饰不可数名词。
例:1. The hotel offers its guests a wide variety of amusements. 2. A variety of food is sold at a supermarket.
被分成
取决于
Burns are divided into three types, depending on the depth of skin damage.
First-degree burns
动词ing作状语
These affect only the top few millimetres of skin. These burns are not
a sense of justice正义感 a sense of duty 责任感 a sense of beauty美感 a sense of safety安全感…
例:1. Your brother has a good sense of humor. 2. Watching them walking arm in arm gives me a sense of happiness.
电击 动词ing作定语
Examples include burns caused by electric shocks, burning clothes, or petrol
B5Unit5-First-aid阅读,知识点树人
What is first aid?
First aid is a ___________________ temporary form of help given to someone who suddenly ___________ or _____________ gets injured falls ill before a doctor can be found.
Accident
cut a bloody nose
上海商学院火灾事件
2008年11月14日6时10 分许,上海商学院一 栋宿舍楼的寝室发生 火灾,四名女生坠楼 身亡。有人为4个年 轻的生命就此陨落而 痛惜,有人对生命消 逝的悲痛,有对花季 少女的惋惜,也有对 大学生自救能力欠缺 的思考。
So When facing a variety of unexpected accidents. What would you do ? Give help as soon as possible namely First aid
1. If a person loses one third of his / her blood, he / she may √ die. 2. In a car accident, we should × try to get the wounded out of the car first. 3. If one stops his / her breath √ about 4 – 5 minutes, his / her brain will be damaged.
假如你是阳光中学高三一班学生李华, 你校校园 网需要招收 英文编辑(web editor),请你根据一 下提示,用英语 向外籍主编Chris 申请这一职位。 1,关心时事,对新闻感兴趣2,有做校刊记者的 经历, 3,擅长英语,曾获校英语写作大赛一等奖。 注意:词数80 ,可适当增加细节3,开头结尾不 计入总词数 审题过程: 时态:现在时 +将来时 /体裁:申请职位 人称: 第一人称 要点,: 可增加细节:期待收到来信
人教版必修五Unit5 First Aid-Reading课件
struck by lightening, or you might get a shock (打击).
A. True
B. False
5. Your friend has an asthma (哮喘) attack,
but she doesn’t have her medicine. You’d better: A. Get a paper bag for her to breathe into. B. Get her a cup of coffee. C. Take her outside for fresh air. Caffeine(咖啡因) can help to dilate(扩 大) the windpipe(气管) .
electric
warm
water touch
mild
liquids
third degree
second degree
second degree
clothing
higher bandage
third wet
Task 5 Role-play & Judgment:
(1) Act out one situation of first aid in or out of the text with your paterners. (2) Ask others what kind of injury it is and whether the first aid measures are right. For example:
2. If you get a nosebleed, gently let your head back to stop the bleeding.
人教版必修5:Unit 5《First aid》Reading (II)
mild . The weather is ______ soft pillow. I like a _____ gentle birth(身世良好). He was a person of ______ gentle/soft/ mild voice. He spoke in a ________________
【 解 析 】 选 D 。 句 意 : 他 一 倒 在 床 上 就 睡 着 了 。 fall
(3) injury n. 损伤;伤害 injury to sth. ……(部位)的伤 He got injuries to the legs at work.
他在工作中伤了腿。
【拓展】 injured adj. 受伤的,有伤的 injure v. 伤害,使(受伤)
【拓展】mildly adv. 轻微地;温和地
mild在此句中的意思是“轻微的,不严重的”。 Edward suffered a mild heart attack. 爱德华有轻微的心脏病。
mild还可以表示“温和的,温柔的;味淡的” 。
She’s the mildest person I have ever met in my life. 她是我生命中遇到的最温柔的人。
【即学即练】
They collected much money ________the poor girl.
A. in aid
C. with the aid of
B. in aid of
D. gave aid to
【解析】选B。句意:他们集资以帮助那位可怜的女孩。in aid后不能接宾语,可排除A项;with the aid of sb.在某人的 帮助下,与句意不符;D项应用非谓语动词形式。in aid of 用以帮助,符合句意。
Unit 5 First Aid Reading and thinking课文讲解课件
二度烧伤 这类烧伤伤及皮肤表层以下。它们是严重的,需要 几个星期才能好起来。例如由灼热的液体引起的烫伤。
include sth/ doing sth 包括(做)某事 minor injuries 轻伤
CAUSES OF BURNS You can get burnt by a variety of things:hot liquids,steam, fire,radiation,the sun,electricity,acids,or other chemicals. TYPES OF BURNS Burns are divided into three types, depending on the depth of skin damage. 现在分词短语作方式状语
3.Remove any clothes using scissors if necessary,unless you see the fabric sticking to the burnt skin.
3.如果有必要,用剪刀剪掉衣服,除非你看到布料已粘在烧伤 的皮肤上。
主句remove any clothes是祈使句;using scissors是现在分词短语作 方式状语;if necessary是状语从句的省略=if it is necessary
FIRSTAID TREATMENT 1.Place burns under cothin the first ten minutes. The cool water stops the burning process and reduces the pain and swelling. 2.Dry the burnt area gently with a clean cloth. 急救治疗 1.将烧伤部位放在流动的冷水下,特别是在烧伤后的前10分 钟内。冷水可以终止烧灼过程,减少疼痛和肿胀。 2.用干净的布轻轻擦干烧伤部位。
人教新课标版高中英语必修五 Unit 5 First aid 知识讲解-教育文档
Unit 5 First aid学习目标重点词汇aid, injury, poison,variety, electric, swell, damage, stick, treat,apply重点短语fall ill,in place, a number of, put one’s hands on, over and over again, squeeze out, make a difference重点句型系表结构get done强调句型知识讲解重点短语aid【原句回放】First aid is a temporary form of help given to someone who suddenly falls ill or gets injured before a doctor can be found. 急救是在医生到来之前对突然生病的人或受伤者的一种暂时的救助。
【点拨】aid n./ vt.援助,救助,帮助1. 用作名词的aid,还可以表示“有帮助的事物”或辅助手段等。
An English dictionary is an important aid in learning English.英语词典是重要的学习英语的工具。
Teachers give their lessons with the aid of computers. 老师们借助于计算机讲课。
He raised money in aid of the sick. 他筹款帮助病人。
2. 用作动词的aid:常用搭配:aid sb in/ with sth. 在某事上帮助某人aid sb. to do sth. 帮助某人做某事I aided the people who suffered from the big earthquake with money.我用钱来援助在地震中受灾的人们。
Vitamin C aids in the absorption of iron. 维生素C有助于铁的吸收。