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重点讲解：
1. or so
…左右；…上下；
eg. The driver usually spends four hours or so helping to load and prepare his lorry.
司机通常花 4 小时左右的时间帮忙装货和打理货车。
eg. Grandad usually sleeps for an hour or so after lunch.
爷爷吃过午饭往往要睡一个小时左右。
eg. We felt a little constraint with the new teacher for the first day or so.
在开头一两天，我们对新教师感到有点拘束。
2. be to do sth.
表示按计划或安排要做的事；
eg. We are to meet at the school gate.
我们将在校门口碰头。
eg. They are to go travelling in August.
他们计划八月份去旅游。
eg. She is to be married next month.
她将于下个月结婚。
n. 约束，强制，约束条件，对感情的压抑，虚情假意
