He wants to keep them all in his office for reasons best known to himself.

他想把他们都留在他的办公室里，原因只有他自己知道。

《牛津词典》

Keep quiet in the office.

请在办公室保持安静。

youdao

You may keep the book in the car, or into the office or to anywhere you go, unless you're sure you won't have time to read.

你可以把书放在车里、办公室里或带去任何你要去的地方，除非你确定你没有时间阅读。

youdao

All your TA's have either already have their extra office hours, or there are some that will be going on tonight or tomorrow, so keep those in mind as your finishing up your studying for the exam.

你们的助教们有的已经做过额外的答疑，而有的会在今天晚上或者明天答疑，因此在你复习准备,考试的时候不要忘了这些。

麻省理工公开课 - 化学原理课程节选

And also, keep in mind that I have office hours today from 3 to 5.

还有一件事就是,要记住我的答疑时间是今天下午三点到五点。

麻省理工公开课 - 化学原理课程节选

Now, if you agree with that choice, by all means, vote to keep them in office.

CNN: Clinton: Time again to choose a more perfect union

The impetus to direct largess toward constituents with the power to keep them in office is always too powerful to resist.

FORBES: Squeezing Every Last Dollar Out Of Democracy

Southerners tend to keep Senators in office forever.

CNN: Senator No