九年级unit12单词知识点

九年级unit12单词知识点
Unit 12 单词知识点
Unit 12单元涵盖了许多与科学相关的词汇。

在本文中，我们将介绍一些重要的单词，并提供相关的定义和用法。

让我们一起来学习并巩固这些新的词汇知识吧！
1. biology (n.) 生物学
Biology is the study of living organisms and their interactions with their environment.
生物学是研究生物体及其与环境的相互作用的科学。

2. chemistry (n.) 化学
Chemistry is the scientific study of the properties, composition, and behavior of substances.
化学是研究物质的性质、成分和行为的科学。

3. physics (n.) 物理学
Physics is the branch of science that deals with matter, energy, motion, and force.
物理学是研究物质、能量、动力和力量的学科。

4. experiment (n.) 实验
An experiment is a scientific procedure undertaken to make a discovery or test a hypothesis.
实验是进行科学研究以发现或检验假设的过程。

5. laboratory (n.) 实验室
A laboratory is a controlled environment where scientific research, experiments, and measurements are conducted.
实验室是一个受控的环境，用于进行科学研究、实验和测量。

6. microscope (n.) 显微镜
A microscope is a device used to magnify and observe small objects that are not visible to the naked eye.
显微镜是一种用于放大和观察肉眼不可见的小对象的设备。

7. element (n.) 元素
An element is a substance that cannot be broken down into simpler substances by chemical means.
元素是一种无法通过化学手段分解为更简单物质的物质。

8. molecule (n.) 分子
A molecule is the smallest unit of a substance that retains its chemical properties.
分子是物质中保持其化学性质的最小单位。

9. gravity (n.) 重力
Gravity is the force that attracts objects towards each other, especially between a celestial body and the Earth.
重力是一种相互吸引的力，尤其存在于天体和地球之间。

10. hypothesis (n.) 假设
A hypothesis is a proposed explanation for an observation or scientific problem that can be tested through experimentation.
假设是对观察结果或科学问题提出的解释，可以通过实验进行验证。

11. theory (n.) 理论
A theory is a well-substantiated explanation of some aspect of the natural world that is based on a body of evidence.
理论是对自然界某一方面的经过充分证明的解释，其基础是一套证据。

12. energy (n.) 能量
Energy is the ability to do work or cause a change in matter.
能量是做功或引起物质变化的能力。

13. adaptation (n.) 适应
Adaptation is the process of changing to fit new conditions or environments.
适应是为了适应新的条件或环境而发生的变化过程。

14. ecosystem (n.) 生态系统
An ecosystem is a community of living organisms and their physical environment, interacting as a system.
生态系统是由生物群落和它们的物理环境组成，作为一个系统相互作用。

15. genetics (n.) 遗传学
Genetics is the study of heredity and the variation of inherited characteristics.
遗传学是研究遗传和遗传特征变异的科学。

16. bacteria (n.) 细菌
Bacteria are microorganisms that are often single-celled and can be found everywhere.
细菌是常常为单细胞并且存在于各处的微生物。

17. virus (n.) 病毒
A virus is a microscopic particle that can infect living organisms and cause diseases.
病毒是一种微小的颗粒，能够感染生物体并引起疾病。

18. mutation (n.) 突变
Mutation is a permanent change in the DNA sequence of a gene or a chromosome.
突变是基因或染色体DNA序列的永久性变化。

以上仅是Unit 12中一些重要的单词和对应的定义介绍。

通过学习这些词汇，我们可以更好地理解科学领域的概念和原理，并且能够更深入地探索自然世界。

希望这些知识对你有所帮助！。