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重点讲解：
1. lay the groundwork for 基础工作；准备工作；
Yesterday's meeting was to lay the groundwork for the task ahead.
昨天的会议是为以后的工作做准备。
2. run for 参加选举；竞选；
He has already stated his intention to run for election.
他已声明打算参加竞选。
3. run out of 用完；耗尽；
Fears that the world was about to run out of fuel proved groundless.
事实证明对于世界燃料即将耗尽的担忧毫无根据。
4. agree on 商定；议定；就…达成协议；
We rarely agree on what to do.
我们很少在要做的事情上看法一致。
adj. 理论上的
