当高速行进的超新星冲击波与稀薄的星际气体相撞时，气体受到压缩和加热，因此而发光。
As the supernova blast wave slams into tenuous clouds of interstellar gas, the resulting collision heats and compresses the gas, causing it to glow.
火球最初的迅速膨胀剧烈地压缩着周围的大气，产生了威力巨大的冲击波。
The initial rapid expansion of the fireball severely compresses the surrounding atmosphere, producing a powerful blast wave.
设想开车经过一处监速站，当你的车开向监速站时，从你的角度看监速站雷达发出的电磁波似乎被压缩过——当然，如果你的眼睛能辨别出这种微小的差别的话。
Imagine driving past a police radar. As your car approached, the electromagnetic waves from the radar would look slightly shrunk to you — if you could see them — when they reached you.
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