airfloat/walk on 'air (informal)1.■be very happy about sth 欢天喜地；喜气洋洋；得意扬扬:When I passed my driving test, I was walking on air for days. 通过了驾照考试以后，我飘飘然高兴了好几天。in the 'air2.■(of an idea, a feeling, a piece of information, etc. 主意、感情、消息等) felt by a number of people to exist or to be happening 在流传中；即将发生:Spring is in the air. 春意盎然。There was a strong feeling of excitement in the air. 四处激情澎湃。(up) in the 'air3.■(of plans, etc. 计划等) uncertain; not yet decided未确定的；悬而未决:I’m hoping to take a holiday this month but my plans are still very much up in the air. 我希望这个月去度假，可是我的计划尚未确定。At the end of the meeting, the matter was left in the air. 到会议结束的时候，这个问题仍悬而未决。,on/,off the 'air4.■(being) broadcast/not (being) broadcast on radio or television 正在/停止播送﹙ 广播、电视﹚ :‘Going Live’ will go off the air for the summer, returning for a new series in the autumn.“ 实况直播”节目夏季将停播，而于秋季恢复播出后将播放一套新节目。5.■appear, etc. out of thin air 另见thin6.■a breath of fresh air 另见breath7.■(build) castles in the air 另见castles8.■clear the air 另见clear9.■disappear, etc. into thin air 另见thin10.■(as) free as (the) air/as a bird 另见free11.■hot air 另见hot12.■in the open air 另见open13.■(as) light as air/a feather 另见light14.■pluck sth out of the air 另见pluck15.■with your nose in the air 另见nose