空くう気き袋ぶくろ

noun

air sac; bladder; air bag; windbag

Refers to any flexible container or biological structure that holds air, such as an inflatable bag, a swim bladder, or an anatomical air sac.

• 魚さかなの空くう気き袋ぶくろは浮ふ力りょくを調ちょう節せつする役やく割わりがある。

  The fish's air bladder has the role of adjusting buoyancy.

• このおもちゃの空くう気き袋ぶくろに空くう気きを入いれてください。

  Please inflate this toy's air bag.