n.  空气

n.  空中，天空

n.  乘飞机；航空

v.  公开发表〔看法〕

v.  播放，广播

v.  使通风

• air-conditioning  n. 空调系统

• air-conditioner  n. 空调机

• aircraft   n. 飞机；飞行器，航空器

• airline   n. 航空公司

• airplane/aeroplane  n. 飞机 ≈ plan

• airport   n. 机场，航空站[港]

• be in the air

  〔某种情绪〕弥漫在空气中；即将发生

• be up in the air  悬而未决

• air your views/grievances/complaints 

  发表意见/抱怨

• It stayed in the air for about two hours.

  在空中

• The air pollution it produced. 空气污染

• In recent years, a growing number of Chinese people have chosen to travel by air during holidays as airline services improve and hugely discounted airfares are available now and then. 近年来，节假日期间选择乘飞机外出旅游的人数在不断增加。

• “One of the risk factors for premature deaths is the air we breathe, over which individuals have little   31  ,” he said.

  呼吸的空气

• It was first developed for the US government as a long-range spy aircraft, but was abandoned following budget cutbacks.

  间谍飞机

• Elon Musk's SpaceX aims to send an unmanned aircraft to Mars by 2018.

  发射无人飞船

• Soon airline tickets, hotel   32  , and even cars and homes could be purchased online. 机票

• Very few people pay attention to him as he walks through the airport in his airline uniform and cap. 航空公司的制服

• Whether adequate investment is being made to improve airport facilities. 改善机场设施

• Loading her luggage onto the airport shuttle. 机场班车

• Our trip is still very much up in the air.

  我们的旅行计划有许多事情尚未决定。

BrE /eə(r)/

NAmE /er/