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。

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The influences of two factors including thickness of scale of cooling water-pipe and air clearance exerting on temperature field of stave is discussed based on calculation.

同时根据计算结果讨论了冷却水管水垢厚度、气隙层厚度对高炉铸钢冷却壁温度场的影响。

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The pilot was given clearance to land by air traffic control.

飞行员得到空中交通管制站发出的着陆许可。

《牛津词典》

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

VOA: standard.2009.10.13

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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And you don't need a license, you don't need right-of-way clearance -- you just shoot through the air.

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Shortly after the restart, Hanlon fired a low ball towards the St Johnstone goal, but Enckelman had it covered, then Sodje delivered a cross to Stevenson who could only take a fresh-air swipe at the ball and Alan Maybury made the clearance.

BBC: Liam Craig