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重点讲解：
1. be famous for 以…闻名的；
例句：The fox is famous for its cleverness and cunning.
狐狸的机敏和狡猾是人所共知的。
2. as well 也；还；
例句：I'm coming to London and my sister's coming as well.
我要来伦敦,我妹妹也会来。
3. because of 因为；由于；
例句：The man was known to the police because of previous convictions.
因为有犯罪前科，警察们都认识这个人。
adj. 在 ... 之前，先，前，以前的
