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重点讲解：
1. a clutch of 一小群；一小簇；
The party has attracted a clutch of young southern liberals.
聚会吸引了一群南部的年轻开明人士。
2. on top of 在上面；在顶上；
She wore her hair loosely knotted on top of her head.
她在头顶上打了个松松的发髻。
3. in response to 回应；
Sudan even threatened to mobilize in response to the ultimatums.
作为对最后通牒的回应，苏丹甚至威胁说要动员军队。
4. work out 计算出，解出；
We need to work out the best fit between the staff required and the staff available.
我们必须算出所需人员与现有人员之间的最佳搭配。
n. 假设，猜测，前提
