Once they leave they can do none of these things.

一旦美军离开，这些事他们就鞭长莫及了。

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Once they leave, there are huge deterrents to coming back.

一旦他们离开了，再回来会十分困难。

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"Once they leave Chinese soil, their role is very limited," Jianguo says.

“一旦离开中国这块土壤，他们能起的作用就很有限，”建国说。

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Once they pass the exams, they can leave high school as early as the end of the second year.

VOA: special.2010.02.25

The educator, Neil Postman once said, " "The kids enter schools as question marks and they leave as periods."

教育家Neil，Postman曾经说过，“孩子进校时像问号而毕业时像句号“

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But even with better data, monsoons are ill-understood once they leave the sea or low-lying land.

ECONOMIST: India��s climate: Monsoon, or later | The

The committee members serve for four years and are prohibited from joining the health care industry once they leave the commision.

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That deals with personnel who are still serving, but once they leave it is the NHS centres which take on their care.

BBC: Rehabilitation at Headley Court