bladder

The bladder stores urine until it is expelled from the body.

膀胱は尿を体外に排出するまで貯めておく。

Fish use their swim bladder to maintain buoyancy.

魚は浮袋を使って浮力を保つ。

The bladder of the football was punctured, causing it to deflate.

フットボールの内袋が破れ、空気が抜けた。