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重点讲解：
1. be used to sth./doing sth. 习惯于；
例句：It doesn't frighten them. They're used to it.
这可吓不倒他们。他们已经习惯了。
2. go back to 追溯到；回溯到；
例句：The feud with the Catholics goes back to the 11th century.
与天主教的夙怨可以追溯到11世纪。
3. make sure 一定要；设法保证；
例句：Make sure that you follow the instructions carefully.
一定要认真按照操作指南来做。
4. on the side 作为配菜；
例句：Serve a bowl of warm tomato sauce on the side for dipping, if desired.
如果你喜欢，可以上一碗热番茄调味汁来蘸着吃。
