Next is what they call a bladder of oxygen that's an inflatable sac, filled with oxygen, to simulate atmospheric pressure.
下一个我们讲的是氧气气囊是一种可充气的气囊，为了模仿大气压力。
Next is what they call a bladder of oxygen that's an inflatable sac, filled with oxygen, to simulate atmospheric pressure.
下一个我们讲的是氧气气囊是一种可充气的气囊，为了模仿大气压力。
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