与此同时，它的位置被更热的星系间气体所取代，这些气体来自更远的星系边缘，在被压缩的过程中冷却并流入星系。
Meanwhile, its place is taken by hotter intergalactic gas from farther out on the edge of the galaxy, which cools as it is compressed and flows into the galaxy.
使用减压调整器或单个的控制阀来安全地从钢瓶中排出气体。采用止回阀，防止回流入钢瓶。
Use a pressure reducing regulator or separate control valve to safely discharge gas from cylinders. Use a check valve to prevent reverse flow into the cylinder.
当有足够的 气体流入时，即可发现三条管中之液体产生不同高度的变化。
A sufficient flow of gas to produce clear difference of water level in the three manometer legs can be generated by blowing through the tube.
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