I kept the engine running because it might be necessary to leave fast.

我让发动机一直开着，因为可能需要快速离开。

《柯林斯英汉双解大词典》

Linda: I want to see your contract. I don't think you can leave that fast.

琳达：我想看看你的合同，我想你不可能这么快离开。

youdao

Better to fast and pray upon it; and still better, it may be, to leave the mystery as we find it, unless Providence reveal it of its own accord.

最好还是靠斋戒和祈祷来解决吧；而最好的办法可能莫过于，留着这宗秘密不去管它，听凭天意自然地揭示好了。

youdao

"I felt that in order to be able to take the right managerial decisions, you need to have full information - and this information needs come to you fast and leave you fast as well, " he tells Russia Business Report in his marble office with great views of the Kazan skyline and a neat arrangement of Blackberry, iPhone and iPad on the desk.

BBC: Tatarstan's government goes electronic

It is in everyone's interest that the bad corporations get out of the scene fast and leave room for the good ones, who can then have access to credit.

CNN: THE REAL WORK BEGINS

And government policy makers worry that money that arrives quickly can leave just as fast, destabilizing local banking, stock and currency markets.

WSJ: Asian Governments Take Measures to Battle Strong Currencies