Why does the professor say this: I'm sorry, you must bubble gas through it.

教授为什么说：说错了，是充入气体。

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Such "chorus waves" form in a region of space that lies just above the plasmasphere, a section of Earth's protective magnetic bubble filled with plasma, or electrically charged gas.

此类在宇宙某一地区内形成的“哨声波”位于等离子层的正上方，这是地球的保护性磁泡，充满了等离子，或者说是荷电气体。

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The process blasted out material to form the bubble structure of glowing gas against denser material in a surrounding molecular cloud.

这个过程形成的炽热气泡结构恰好可以抵御周围分子云中密度更高物质的压力。

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Herschel's view of RCW 120, a bubble of gas and dust in space around a massive star.

BBC: Herschel space telescope to go blind

The friction caused by the gas bubble pushing up the pipe and displacing the drilling mud used to control the pressure could have created a static charge that ignited the gas into a fireball.

FORBES: BP's Deepwater Disaster: What Happened And Why?

Even a relatively small amount of gas a can cause big problems because a gas bubble will expand massively as it moves from high pressure at the seafloor to lower pressure at the surface.

FORBES: BP's Deepwater Disaster: What Happened And Why?