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重点讲解：
1. take effect 开始实施；生效；
Productivity is up by 11% since the new contract took effect.
自从新合同生效起，生产效率提高了11%。
2. team up with (与…)组队；(与…)协作；
He didn't want to team up with anybody.
他不想与任何人合作。
3. take part 参加；参与；
We had the devil's own job to persuade him to take part.
我们说服他参加可费了一番周折。
4. sb. can't have it both ways 二者不能兼得；
Countries cannot have it both ways: the cost of a cleaner environment may sometimes be fewer jobs in dirty industries.
各国不可能两全其美：环境更清洁的代价有时可能就是污染企业就业岗位的减少。
