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重点讲解：
1. at times 有时；间或；
The debate was highly emotional at times.
辩论有时变得异常情绪化。
2. set off 引发；触发；激起；
It set off a chain reaction in the international money markets.
这一事件在国际金融市场上引起了连锁反应。
3. birng down 使倒下；
The quake brought down many significant buildings in Port-au-Prince, including all the hospitals and the Presidential Palace.
这次地震还导致太子港许多重要建筑倒塌，其中包括所有的医院和总统府。
4. break down （讨论、关系或系统）失败，破裂，失灵；
Many people were expecting the peace talks would break down.
许多人预料和平谈判会破裂。
