acapnia
  缺碳酸血症; 血液二氧化碳缺乏
  acap·nia /əˈkæpnɪə, (ˈ)eˈ/ 名詞
  缺碳酸血症,血液二氧化碳缺乏,血液碳酸缺乏
  acapnia
       n : a state in which the level of carbon dioxide in the blood is
           lower than normal; can result from deep or rapid
           breathing [syn: hypocapnia] [ant: hypercapnia]