Do you sell duty-free on the plane?

你们有在机上贩售免税商品吗？

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On the basis of preceding main results, a mechanic model of overburden-karstic free face with a weak structural plane is presented in this paper.

本文在总结前人成果基础上，提出存在一个软弱结构面的覆盖岩溶临空面的力学模型。

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The effects of velocity ratio of free streams on the particle sedimentation in liquid-solid two phase plane mixing layer are studied by flow visualization method.

本文采用流动显示的方法对平板混合层中上下层流体速度比对固体颗粒在混合层中沉降的影响进行了研究。

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We can't promise your trip to the airport will be ice-free, but there won't be any icy buildup on the plane getting you to your holiday destination.

CNN: Airplane deicing: The how and why

Some continue to fly even in their free time, while others cherish "staycations" or find ways to globe-trot without getting on a plane.

CNN: Inside a flight attendant's not-so-glam life

This passenger drank an entire bottle of duty free liquor early on in the flight and became belligerently drunk and proceeded to physically harm other passengers and scream the plane was going to crash.

FORBES: Going Viral For Something You Didn't Do