英语单词分类 轻松记单词

air sac

air sac基本解释

气囊

air sac同义词

air sac英英释义

Noun:
  • a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

  • any of the thin-walled extensions of the tracheae of insects

  • any of the membranous air-filled extensions of the lungs of birds