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重点讲解：
1. in search of 寻找；寻求；
Rescue workers are digging through the rubble in search of other victims.
救援人员正在废墟中挖掘，以搜寻其他受害者。
2. engage in 参与；从事；
Nowadays, office workers rarely engage in regular exercise.
现在，上班族很少定期进行锻炼。
3. look out for 搜寻；
I'll look out for Mr Jackson and give him your message.
我要去找杰克逊先生，转达你的口信。
4. in order to 为了；以便；目的在于；
In order to get a complete picture, further information is needed.
为掌握全面情况，还需要详细资料。
vi. 弄暗，暗下来 vt. 使变暗，使阴郁，败坏，使模
