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重点讲解：
1. go over 复习；重温
Let's go over it again, shall we?
我们再复习一下，好吗？
2. at any given time 在任何时候
Parents do the best they can at any given time.
父母在任何时候都是尽他们所能去做。
3. heavy equipment 重型设备
The oil company will ship out piping and heavy equipment.
这家石油公司将用船运出输油管道和重型设备。
4. in an effort to 为了...；试图要...
The company has laid off 150 workers in an effort to save money.
公司为节省资金遣散了150名工作人员。
