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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；
They have been involved in a campaign of deceit.
他们参与了一系列的欺骗活动。
2. find out (尤指特意通过努力)发现，找出，查明；
I haven't found anything out about him yet.
我还没有发现有关他的什么情况。
3. engage in 参与；从事；
We never engage in irregularities.
我们决不搞歪的邪的。
4. take advantage of 利用；
She took advantage of the children's absence to tidy their rooms.
她趁孩子们不在时收拾了他们的房间。
n. 运动，活动，战役，竞选运动
v. 从事运
