飞场频率管控对飞行安全极为重要。

Fly field frequency control is a key to fly field safety.

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飞场频率管控对飞行安全极为重要。

I have been to fly fields and observed various frequency control practices.

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飞机发动机防冰对飞行安全具有十分重要的意义，对于热气防冰系统，前缘防冰器的结构型式对防冰的效果影响很大。

The results indicate that the structure of frontal anti icer affects anti icing effectiveness obviously for a hot air anti icing system, the double skin chord direction anti icer I.

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