flap of skin which blocks the throat passage and stops the water going down into the lungs 意味

• のどの通路｛つうろ｝をふさいで水が肺へと入り込むのを防ぐ皮膚の弁
  

• prevent food from going down the windpipe toward the lungs:    食物｛たべもの｝が気管｛きかん｝から肺に下がることを防ぐ
• flap of skin:    皮膚｛ひふ｝の弁［たるみ］、皮弁｛ひべん｝
• skin flap:    皮膚弁｛ひふべん｝、皮弁｛ひべん｝