Why did you need a room unless you were up to something?

除非你要捣什么鬼，不然为什么需要一个房间呢？

《柯林斯英汉双解大词典》

Up until now, it was possible to run unit tests against your personal Twitter account without anybody knowing what you were up to.

到目前为止，可以在个人Twitter帐户上运行单元测试，而其他人并不知道您要干什么。

youdao

By contrast, the idea that communication becomes a random broadcast to 500 "friends" about what you were up to last night is perfectly incomprehensible.

相比之下，那种“交流即是随机向500位好友'播报昨晚都干了些什么”的想法，委实令人费解。

youdao

"It's always thrilling to see the flowers that you were brought up with and that you have seen all tame and domesticated in European gardens and here they are en masse and more as you knew them."

VOA: standard.2010.08.09

But the things we were trying to stress were that it's an important design decision when you are coming up with a piece of code, as to what kind of efficiency your code has.

但是我们这里要强调的是,当你写代码的时候,决定你的代码的效率的很重要的事情，就是你的设计决定。

麻省理工公开课 - 计算机科学及编程导论课程节选

We were given an assignment to come up with an idea of something you'd like to work on.

我们的任务是想出,自己想要做的项目。

斯坦福公开课 - Twitter之父Jack.Dorsey演讲：好奇和灵感的力量课程节选

It was the oldest game in Afghanistan, and a particularly dangerous one if all of the concerned parties found out what you were up to.

NPR: Sergeant Notes Odd Rituals of War in Afghanistan

Just calling to see what you were up to.

FORBES: What Is It Like When Someone You Know Suddenly Becomes Rich And Famous?

The Caterpillar phone features something called wet finger tracking, so even if you happen to fall into a deep puddle while using your B15, you can finish whatever you were up to before tumbling.

ENGADGET: Caterpillar CAT B15 rugged smartphone hands-on Hands-on