n.膀胱；囊；囊状物
The urethra originates at the neck of the bladder. 尿道起始于膀胱颈部。
I'm going to do bladder irrigation for you. 我要给您做膀胱冲洗。
The bladder is thin-walled and closed by a one-way valve. 浮囊具有薄壁的结构并且通过单方向的阀门关闭。
