超音速的飞机只允许在水上飞行，这样就只限于往返于被海洋隔开的富裕的国家——因为声震可以毁坏东西和给在地面上的人产生噪声。

Supersonic flights are allowed only over water-and are thus limited to connecting wealthy cities separated by an ocean-because sonic booms can damage things and annoy people on the ground.

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由于具有低噪声输出，并采用了加固设计，它能用于军事与航空应用，包括机载、舰载和地面应用。

With its low noise output and rugged design, the 55lq2 is for military and aerospace programs, including airborne, shipboard, and ground applications.

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本文介绍螺桨飞机舱内噪声的地面模拟方法和主动控制实验。

This paper presents the analogized methods and the active control experiments of the cabin noise for a propeller airplane.

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