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重点讲解：
1. choose to do sth. 选择；
We chose to go by train.
我们选择乘火车去。
2. be designed to do sth. 计划；打算；意图；企图；
The move is designed to boost sales during the peak booking months of January and February.
这一举措旨在增加1月和2月预订高峰期的销售量。
3. lead to 招致；致使；导致；
A lack of prudence may lead to financial problems.
不够谨慎可能会导致财政上出现问题。
4. call for 要求；呼吁；
They called for the immediate release of the hostages.
他们要求立即释放人质。
