1. 恶作剧;淘气;使坏的念头
    Mischief is playing harmless tricks on people or doing things you are not supposed to do. It can also refer to the desire to do this.

    e.g. The little lad was a real handful. He was always up to mischief...
           这个小家伙真是难管教，他总是搞恶作剧。
    e.g. Boys at that age should be able to explore and go off on their own, go on bike rides, get into mischief...
           那个年龄的男孩应该可以自己出去闯，也可以骑车出游，还可以调皮捣蛋。

2. 惹麻烦之事;引起问题的行为；损害;麻烦
    Mischief is behaviour that is intended to cause trouble for people. It can also refer to the trouble that is caused.

    e.g. The more sinister explanation is that he is about to make mischief in the Middle East again...
           更为险恶的解释是，他准备再次在中东地区制造事端。
    e.g. They withdrew their support after the President described the conference as a platform to cause political mischief.
           在总统称这次大会是在制造政治事端之后，他们便撤回了对这次会议的支持。