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重点讲解：
1. used to do sth.
过去常常；过去曾做某事；
eg. I used to get up early and take an hour's walk before breakfast.
我过去常常起床很早并且在早餐前散步一小时。
eg. Women used to think they were on the shelf at 30.
过去女人一到30岁就认为是过了结婚年龄。
eg. Jack used to assist Mary in her lessons.
杰克过去常常帮助玛丽学习功课。
2. get up
起立；站起来；
eg. I got up and walked over to where he was.
我起身走到他那边。
eg. The class got up when the teacher came in.
老师进来时全班起立。
n. 轻咬，啃 v. 一点点地咬，慢慢啃，吹毛求疵
