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重点讲解：
1. by the end of 到...结束时
By the end of the holiday I had spent all my money.
到那个假期结束时我已经花光了我所有的钱。
2. be willing to do sth. 乐意做某事
I'm perfectly willing to discuss the problem.
我十分乐意讨论这个问题。
3. bring an end to 结束；使...完结
The trip will bring to an end years of estrangement between the two countries.
此行将会结束两国多年来的疏远关系。
4. take part in 参与
I was quite sulky, so I didn't take part in much.
我相当闷闷不乐，所以没有怎么参与。
