单位符号英文说法

单位符号的英语说法

1/2 = a (or one) half

1/3 = a (or one) third

1/4 = a quarter or one fouth

1/5 = a (or one) fifth

2/3 = two thirds

9/10 = nine tenths

53/4 = five and three quarters

15/64= fifteen over (or by) sixty-four 15% = fifteen per cent

4‰ = four per mill

R’ R prime

R” R double prime, R second prime

R1 R sub one

100° C one hundred degrees Centigrade + plus; positive

- minus; negative

´ multiplied by; times

¸ divided by

± plus or minus

= is equal to; equals

º is identically equal to

» is approximately equal to

( ) round brackets; parentheses

[ ] square brackets

{ } braces

a＞＞b a is much greater than b

a³ b a is greater than or equal to b

aµ b a varies directly as b

lognX logX to the base n

the cubic root of x

the nth root of x

x2 x square, x squared, the square of x

Xn X to n factors; the nth power of x; x to the power n x -8 x to the minus eighth power

ï xï the absolute value of x

the mean value of X

the sum of the terms indicated; summation of

D x or d x the increment of x

dx differential x

dy/dx the first derivative of y with respect to x

ò integral

¥ infinity

1/2 a half; one half

2/3 two thirds

5/123 five over a hundred and twenty-three

eight and three over fourths; eight and three quarters

O point O one; zero point zero one; nought point nought one

6 % 6 percent

3‰ 3 per mille

2 :

3 the ratio of two to three

r=xd r equals x multiplied by d

5´ 2=10 five times two equals ten

x3/8=y2 x raised to the third power divided by eight equals y squared (a+b-c´ d)/e=f a plus b minus c multiplied by d, all divided by e equals f y = (Wt-W)/x y equals W sub t minus W over x

符号的英文读法

．period 句号

≈ is approximately equal to 约等于号

，comma 逗号

＜is less than 小于号

：colon 冒号

＞is more than 大于号

；semicolon 分号

≮is not less than 不小于号

！exclamation 惊叹号

≯is not more than 不大于号

？question mark 问号

≤ is less than or equal to 小于或等于号￣hyphen 连字符

≥ is more than or equal to 大于或等于号' apostrophe 省略号

；所有格符号

％per cent 百分之…

- dash 破折号

‰ per mill 千分之…

' ' single quotation marks 单引号

∞ infinity 无限大号

double quotation marks 双引号

∝varies as 与…成比例

( ) parentheses 圆括号

√ (square) root 平方根

[ ] square brackets 方括号

∵since; because 因为

《》French quotes 法文引号;书名号

∴hence 所以

... ellipsis 省略号

∷equals, as (proportion) 等于，成比例¨ tandem colon 双点号

∠angle 角

ditto 双点号

⌒semicircle 半圆

‖parallel 双线号

⊙circle 圆

／virgule 斜线号

○ circumference 圆周

＆ampersand = and

π pi 圆周率

～swung dash 代字号

△triangle 三角形

§ section; division 分节号

⊥perpendicular to 垂直于

→arrow 箭号；参见号