New words：
component [kəmˈpoʊnənt] n.成分；部件；组成部分
Sample Sentences：
There are many components to the machine.
Trust is a vital component in any relationship.
Each component of the model plane must be put together carefully.
vital [ˈvaɪt(ə)l] adj.必不可少的；至关重要的
New words：
composer [kəmˈpoʊzər] n.作曲家；创作者；作曲者
Sample Sentences：
Who is the composer of the song?
He was born to be a great composer.
New words：
compose [kəmˈpoʊz] v.组成；创作(乐曲、诗歌等)；使镇静be composed of 由…组成
Sample Sentences：
Mozart composed a lot of music.
Yesterday he composed a piece of music.
All living things are composed of cells.
We should compose ourselves in the face of fear.
I was so confused that I could hardly compose my thoughts.
New words：
hydrogen [ˈhaɪdrədʒən] n. 氢；氢气
hydrogen gas 氢气
Sample Sentences：
Water is composed of hydrogen and oxygen. Hydrogen is the lightest gas in the universe.
When hydrogen burns in air, it produces water.
compose [kəmˈpoʊz] v.组成；
New words：
analysis [əˈnæləsɪs] n.分析；分析结果
Sample Sentences：
My teacher asked us to write an analysis of the story.
She did a detailed analysis of the experiment results.
The blood samples are sent to the laboratory for analysis.