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重点讲解：
1. prevent sb. from sth./doing sth. 阻止；制止；阻碍；
The condition prevents the blood from circulating freely.
这种病阻碍了血液的循环畅通。
2. take place （尤指在控制或组织下）发生，进行，举行；
No official permission has been given for the event to take place.
这项活动未得到正式批准，不能进行。
3. in exchange for 作为交换；
The trade unions bargained away their rights in exchange for a small pay rise.
工会不惜牺牲自己的权利以换取微薄的加薪。
4. be involved in 卷入的；参与的；与…有密切关联的；
Many people were involved in this conspiracy, but three stand out.
很多人参与了这场阴谋，但有3个人是主谋。
