1. 合作，协作(尤指著书或做研究)
    When one person or group collaborates with another, they work together, especially on a book or on some research.

collaborate的意思

    e.g. He collaborated with his son Michael on the English translation of a text on food production...
           他和儿子迈克尔合作，把一篇介绍食品生产的文章译成了英文。
    e.g. The government is urging Japan's firms to collaborate with foreigners.
           政府正在督促日本的公司进行更多的海外合作。

2. 通（敌）;勾结(敌人)
    If someone collaborates with an enemy that is occupying their country during a war, they help them.

collaborate是什么意思

    e.g. He was accused of having collaborated with the secret police.
           他被控与秘密警察勾结。