If you co-operate with someone, you work with them or help them for a particular purpose. You can also say that two people co-operate .
例句
The UN had been co-operating with the State Department on a plan to find countries willing to take the refugees...联合国一直都在与美国国务院合作推进一项计划，寻找愿意接纳难民的国家。The couple spoke about how they would co-operate in the raising of their child...这对夫妇讲述了他们将如何共同抚养孩子。
VERB
合作;配合
If you co-operate, you do what someone has asked or told you to do.
例句
He agreed to co-operate with the police investigation...他同意配合警方的调查。The plan failed because the soldiers refused to co-operate.因为士兵们不肯合作，这项计划宣告失败。