重点讲解：
1. used to do sth. 过去常常；过去曾；
例句：It used to cost nothing to visit a museum.
过去参观博物馆是不收分文的。
2. each other 彼此；互相；
例句：They're constantly at odds with each other.
他们常互相争吵。
3. as well 也；还；
例句：Tom is very unfriendly to me as well.
汤姆对我也很不友善。

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