be up to something

常见例句

She must be up to something.
她一定在搞什么鬼花招。
He must be up to something.
他一定是背后有什么目的吧。
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I heard you two whispering so I know you must be up to something .
我听见你们俩嘀嘀咕咕的就知道没做什么好事。

And that's something that you have to be willing to put up with."
Deflection up and deflection down indicating that there was something strange that had yet to be accounted for.
发生了偏离,这就说明还有一些奇特的现象,需要我们去解释。
麻省理工公开课 - 固态化学导论课程节选
so I don't know, I think it's just really cool to be able to work something from the ground up.
所以，我不知道，我就是觉得能从头开始做一件事很酷。
什么是认知科学？ - SpeakingMax英语口语达人

So I believe that everybody should be prepared to give up something in order to solve our budget challenges, and I think most public servants agree with that.
WHITEHOUSE: President Obama and Vice President Biden Address National Governors Association The White House
Microsoft wants people to build internet infrastructure that has the ability to feed high definition video to every screen in your house, so we want the incentive to be there for people to build up new networks and we want that network to be something that content from everyone is sort of treated in a reasonably equal way.
ENGADGET: A lunchtime chat with Bill Gates at CES
Developers like Facebook would be wise to come up with something for Windows 8 posthaste.
ENGADGET: Windows 8 review