重点讲解：
1. used to do sth. 过去常常；过去曾；
例句：People used to come and visit him every day.
人们过去每天都来拜访他。
2. as of 在…时；从…起；自…始；
例句：As of this writing, no reply has been received.
到写这封信时为止，尚未得到答复。
3. in the middle of (某件事或某段时间的)中期；
例句：She was born in the middle of a rain storm.
她出生在一场暴风雨中。
4. go off 对…不再喜欢；失去对…的兴趣；
例句：I started to go off the idea.
我开始对这一想法失去兴趣了。

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