As the supernova blast wave slams into tenuous clouds of interstellar gas, the resulting collision heats and compresses the gas, causing it to glow.
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。
The piston then travels back in the other direction and compresses the refrigerant gas causing a large increase in pressure.
活塞然后向反方向移动，压缩气态制冷剂，引起压强急剧升高。
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