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重点讲解：
1. be involved in 卷入的；参与的；与…有密切关联的；
She has been involved in the war against organised crime.
她参与了打击有组织犯罪的斗争。
2. carry out 实施；执行；实行；
The operator has to be able to carry out routine maintenance of the machine.
操作员必须能对机器进行日常维护。
3. end up 最终；结果；到头来；
He never dreamed that he would end up owning such a lot of property.
他做梦也没想到他最后会拥有这么一大笔财产。
4. differentiate between 区分；区别；辨别；
A child may not differentiate between his imagination and the real world.
儿童可能无法将自己的幻想与真实世界区分开来。
