&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

in the air

Abroad; prevalent

广泛的；流行的

Excitement was in the air.

到处充满了兴奋之情

up in the air

Not yet decided; uncertain.

未决定；未确定