They must also keep swimming to keep from sinking, since most have largely or completely lost the swim bladder, the gas-filled sac that helps most other fish remain buoyant.
它们还必须不停地游动以避免下沉，因为大多数鱼基本上或完全失去了鱼鳔，这个充满气体的囊帮助大多数其他鱼保持浮力。
The pressure in the swim bladder is regulated by a gas gland.
鱼鳔中的压力由一个气体腺来管控。
The nitrogen gas precharged bladder inside the Pulse-Stop dampens the pressure pulsations created by the reciprocating action of the pumps.
氮气首先给气囊充气，以消除脉冲停止时的由往复式活塞泵产生的压力脉动。
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