I especially like the wooshing sound they make as they go flying by.

我尤其喜欢它们飞驰而过时发出的嗖嗖声。

youdao

Airplanes flying faster than sound create a cone of pressurized air molecules that extends to the ground, as NASA explains.

据NASA解释，飞机在超音速飞行时会产生延伸到地面的加压空气分子锥。

youdao

Neighbors undoubtedly heard the low-flying helicopters the sound of one crashing and the sporadic explosions and gunfire that ensued but nobody came outside.

邻居们无疑都听到了低空飞过的直升飞机，其中一架坠落的声音和不时的爆炸与相继的枪声。但没有人出来。

youdao

It was flying more than five times the speed of sound.

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Neighbors undoubtedly heard the low-flying helicopters, the sound of one crashing, and the sporadic explosions and gunfire that ensued, but nobody came outside.

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