- work closely with
- 与: take part in; participate in
- 密切合作: hand in glove
- 密切合作: hand in [and] glove 多年来, 他一直与那位市长密切合作。 he has been hand in [and] glove with the mayor for years
- 促进密切合作: spur/promote intensive cooperation
- 在这一方面的密切合作: close co-operation in this respect
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