You must sign guests out when they leave the club.

客人离开俱乐部时，你必须为他们签退。

《牛津词典》

You must turn in your pass when you leave the building.

你离开大楼时必须交还通行证。

《牛津词典》

You must leave your full name and contact details when you phone.

你打电话时必须留下自己的完整姓名及用于联络的详细资料。

《柯林斯英汉双解大词典》

But he said Anderson must say exactly when he and his men would leave.

VOA: special.2009.08.06

And I must also stress that transition,when it happens, doesn't mean NATO forces leave.

VOA: standard.2009.10.23

Not only are there delays in projects when people leave and new ones must be brought up to speed, but knowledge falls through the cracks.

FORBES: The Key to Keeping Your Employees: Do It the Old-Fashioned Way

Private service professionals must know when to enter and leave a room, when to be present but unnoticed, how to tactfully update a principal with household information.

FORBES: Modern-Day Downton Abbey: Inside The Super-Secret World Of Estate Management

Foreign journalists with video cameras are still working in central Iraq, but now circumstances are such that when they leave their fortified compounds, they must travel in pairs of cars, accompanied by armed guards.

ECONOMIST: Iraq documentaries