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重点讲解：
1. kinds of 各种各样的；不同种类；
Many kinds of animals have vanished from the earth.
许多动物已从地球上消失了。
2. try to 设法；试图；
Don't try to deceive me.
你别诳我。
3. be unable to 不会；不能做某事；
She seemed to be unable to rouse herself to do anything.
她似乎打不起精神去做任何事情。
4. have to 不得不；必须；
We have to resolve this matter once and for all.
我们必须彻底解决这一问题。
