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重点讲解：
1. fence off (用围栏、篱笆等)将(一块地)围起来；
When she and Luther got their house, they would fence off a lawn and raise roses from cuttings.
等她和卢瑟有了自己的房子，他们就会围起一块草坪扦插玫瑰。
2. respond to 应对；作出回应；作出反应；
So far the police have refused to respond to their provocations.
截至目前为止，警方并未对他们的挑衅作出反应。
3. in the first place 起初；一开始；
I should never have taken that job in the first place.
我当初就不该接受那份工作。
4. on edge 紧张不安；烦躁；
Everyone's nerves were on edge.
人人都觉得紧张。
n. 克制，控制，管制，操作装置
vt. 控制
