他们离开机场时不断地向我们招手。
They waved again and again to us when(while) leaving the airport.
机场有大批的旅行团滞留，好多旅客说他们的导游告诉他们离开机场大厅去外面很不安全。
We saw large tour operators, groups that were there, many of them saying that their tour guides were telling them that it just simply was not safe to leave the airport and go outside.
国际中转旅客从不会离开机场，这对于航空公司产业来说非常有益，只不过他们经济价值的局限性很强。
International transfer passengers who never leave the airport are useful to the airline industry, but they are of little wider economic value.
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