| 短语 | be up to something |
| 释义 | be up to something在打什么坏主意;在搞什么鬼：I think the mischievous child is up to something now，he often keeps himself in his room and does something others do not know.我想那个淘气的孩子现在是在搞什么鬼，他时常在自己屋里做一些别人不知道的事。 |
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