This channel comes on the air every morning at 7 am.

Turn on the air conditioner -- I'm baking in here.

开冷气!这里热极了.

There will be an opera on the air this evening.

今天晚上要广播一出歌剧.

That radio show is still on the air.

那个广播剧还在播送.

We shall be on the air in 5 minutes.

过五分钟我们开始广播.

She is singing on the air.

她正在广播歌曲.

When the show went on the air , it was the hit of the season.

那个节目播出后, 成了该年度的最佳节目.

There, the moisture is either deposited on the air-filter element, restricting its flow.

这时, 湿气会附在空气滤清器上, 而限制了它的流动.

She didn't know she was on the air when she said those crazy things.

当她说那些疯狂事的时候,她不知道已经在广播了.

The oven operates on the air-bath principle.

恒温槽工作基于空气浴原理.

Troops are on the alert against any possible aggression.

军队戒备着可能的来犯.

Police are warning the public be on the alert for suspicious packages.

警方警告公众要警惕可疑包裹.

They did their best to keep on their guard [ on the alert ] .

他们尽量保持 警惕.

Knowing that danger threatened , the sentry was on the alert.

因为知道危险势将发生, 这哨兵加意戒备.

These are the Chinese need to be on the alert.

这些都是需要中方警惕的.

Her fears had always been on the alert for an upheaval.

她日夜提心吊胆,严防突变.

The policemen were on the alert for an excaped convict.

一名逃脱犯令警方全面警戒.

They must be constantly on the alert for the enemy.

他们必须随时注意敌人.

The sentries were all on the alert.

哨兵们都警戒着.

He drew this conclusion on the analogy of yours.

他根据你的理论类推得出这个结论.

These are on the average better educated than those in the marketplace.

一般来说,这些年轻人比那些在市场上工作的人受教育的程度高一些.