Those kids are always up to no good.
那些孩子尽会恶作剧。
Aha! I knew it! You guys are up to no good.
啊哈！我知道了！你们这些家伙果然不怀好意。
There's something odd about the way that fellow is behaving. I am sure he's up to no good.
那个人形迹可疑，肯定要做坏事。
It was an accepted fact anyone who lingered there after midnight was usually up to no good.
大家都认为那些午夜还在外闲逛的都不是什么好人。
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