It expels gas to descend, and expels water from trim bladders to rise.
它通过排出气体来下降，并通过把水排出气囊来上升。
With a thin scream, like a tea-kettle whistle, the medusa starts to descend.
随着一声像茶壶煮开了水那样的微弱的叫声，水母开始下降。
The pilots did descend to the wrong altitude then, thinking they were following the air controllers' instructions.
飞行员确实以错误的高度下降，并以为他们遵循了空中管制员的指示。
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