如果一位公开演讲的人，在给你们作报告时，他老是在摆弄一支铅笔或者是摆弄他的眼镜，那么，他这是很清楚告诉你，他心情很紧张。
If a public speaker (like a professor, for example) is all the time fiddling with a pencil, or with his glasses, while he is talking to you, he is telling you quite clearly that he is nervous.
这是因为折射的作用，这根你把铅笔的一半放在水中，会看起来有点歪斜的道理是一样的。
Because of the function of refraction, if you put half of the pencil into the water, it looks askew.
这是我的钢笔，你的钢笔在桌子上，他们的钢笔在铅笔盒里。
This is my pen, your pen is on the table, and their pens are in the pencil case.
这是我的钢笔，你的钢笔在桌子上，他们的钢笔在铅笔盒里。
This is my pen, your pen is on the table, and their pens are in the pencil case.
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