air bedn.气床垫airn.空气；天空；空中；感觉；神态；曲调；装腔作势v.晾干；使通风；广播Air Force Mission Support System空军任务支援系统Air Force Central NOTAM Facility空军"诺塔姆"设施中心Air Navigation Development Board空中导航发展委员会Air Force Advanced Flying School空军高级飞行学校Air Intelligence Watch Condition空军情报值班状况air-refueling shock alleviator空中加油(装置)油液冲击阻尼器Air Pollution Control Technology大气污染控制技术air-defense command efficiency射击指挥效率Air Traffic Control Radar System空中交通管制雷达系统Air Force Reports Control System空军报告控制系统

1. They can block air passages or sinus channels to cause a variety of grief.
   它们能阻塞气道或鼻窦的通道，造成各种痛苦。
2. It is commonly caused by chronic alveolar hypoventilation or air way mucus plugging.
   究其原因，可能为肺泡慢性通气不足或气道分泌物阻塞。