&B{airs and graces}derogatoryan affectation of superiority
(贬)装腔作势
&B{by air} in an aircraft
空运，乘飞机
all goods must come in by air.
所有的货物必须用空运。
&B{in the air} noticeable all around; becoming prevalent
显而易见的；流行中的
I smell violence in the air.
我明显地闻到了暴力的气息。
&B{on 或 off the air} being (or not being) broadcast on radio or television
广播，在广播／停止广播
&B{take the air} go out of doors
去户外
&B{up in the air} (of a plan or issue) still to be settled; unresolved
（计划，问题）悬而未决的
the fate of the power station is up in the air.
发电站的命运悬而未决。
&B{walk 或 tread on air} feel elated
得意洋洋
Abroad; prevalent
广泛的；流行的
Excitement was in the air.
到处充满了兴奋之情
Not yet decided; uncertain.
未决定；未确定