In order to settle increasing air traffic, ICO bring forward the concept of free flight.
为了解决日益增长的空中交通量，国际民航组织提出了自由飞行的概念。
From the view of fluid mechanics, the shear-free air water interface corresponds to a slip boundary condition in fluid and relatives to the concept of effective slip length.
从流体力学的角度来看，这个无剪切界面对应着流体中的滑移边界条件，而与此相关的概念是有效滑移长度。
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