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重点讲解：
1. be eager to do sth.
热切的；渴望做某事；
eg. Robert was eager to talk about life in the Army.
罗伯特很想谈谈陆军生活。
eg. He was eager to match his knowledge against mine.
他很想和我比比，看谁的知识更丰富。
2. by oneself
独自；单独；
eg. He lives all by himself in that large house.
他独自一人住在那所大房子里。
eg. They finished the work by themselves.
他们自己完成了这项工作。
3. all right
安全健康（的）；平安无恙（的）；
eg. All she's worried about is whether he is all right.
她所担心的只是他是否安然无恙。
Are you feeling all right now?
现在你感觉还好吗？
adj. 基本的，初级的，元素的
