air clearance

基本解释

With the development of air freight, the reform of air clearance is necessary.
根据航空货运业的发展，空运通关改革势在必行。
The requisition of improving the air clearance accurancy in the large scale synchronous machine erection and changing configure method are presented.
分析了泵站运行中常见的机组功率相差较大的原因，明确提出需要提高大型同步电机空气间隙安装精度和改变安装方法。
The calculation result shows that the influence of different air clearance beneath train body on aerodynamic drag is quite limited, but its effect on the aerodynamic lift is fairly strong.
计算结果表明，车下空气隙的大小对列车运行的空气阻力只有微小的影响，但对气动升力的影响较大；

The support troops perform a variety of functions such as mine clearance, equipment servicing, construction,air support, medical services and many others.

Russian officials say they gave the go-ahead to let the plane through despite its improper clearance but the flight crew says Russian air-traffic controllers reportedly turned them back.
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Now, the association's leaders have identified 11 sectors, including electronics, tourism, health care and air travel, in which they hope to remove tariffs, harmonise standards, and expedite customs clearance.
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Given the apparently excessive size of the clearance and the eccentric choice of route, some detect a stink of corruption in the smoky air.
ECONOMIST: A potent mix of heat, haze, alcohol and corruption