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重点讲解：
1. be known as 称为；叫做；
She was known as the "Iron Lady".
大家都称她为“铁娘子”。
2. be involved in 卷入的；参与的；与…有密切关联的；
Three teams are involved in the chase for the championship.
有三支队伍参加冠军的角逐。
3. take over 接管，控制；
Following his late father's will, he was given the right to take over all businesses.
遵照已故父亲的遗嘱，他有权接管所有的企业。
4. go on 进行；发生；
While this conversation was going on, I was listening with earnest attention.
这场对话进行的时候，我聚精会神地听着。
