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1·Breaking the sound barrier generates a sonic boom, so supersonic travel is heavily restricted over land.

打破音障时会产生音爆，所以超音速飞行在陆地上空有诸多限制。

2·U. S. Navy photographer with lightning-fast reflexes captured this image of a fighter plane blasting through a sonic boom cloud as the jet broke the sound barrier.

一位美国海军摄影师敏捷地捕捉到了战斗机在突破音障时，产生“音爆云”的图片。