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621. on earth  究竟,到底

 

What on earth had Luke done?

卢克究竟做了什么?

 

622. on fire  起火着火

 

The workshop is on fire.

车间[工厂]起火了。

 

623. on foot   步行

 

I go to school usually on foot.

我上学通常是走路去。

 

624. out of contact with  与...失去联系

 

I have been out of contact with her for three years.

我与她失去联系已有三年。

 

625. on hand  在场,在手边

 

She was not on hand.

她不在场。

 

There is a dictionary on hand to help during his private study periods.

他学习时总是把词典放在手边。

 

 

626. on occasion  有时,间或

 

You have on occasion surprised people.

你有时使人们感到诧异。

 

627. out of control   失去控制

 

The fire is burning out of control.

熊熊燃烧的大火正在失去控制。

 

628. on purpose  故意地

 

Maybe he does this on purpose?

也许他是故意这么做的?

 

629. on sale  出售,廉价出售

 

All tickets go on sale this Friday.

所有票在本星期五开始销售。

 

630. on schedule  按时间表,准时

 

The goods arrived on schedule.

货物已如期运到。