bladders
[解剖]膀胱
囊状物
可充气的囊袋（bladder 的名词复数）
例句
It pumps water out of tiny bag-like bladders, making a vacuum inside.
它把水从像袋子一样的囊状物里抽出来，使囊状物的内部形成真空状态。
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。
Do Na 'vi actually have gall bladders?
Navi族真的有胆囊吗？
