on-

A serial killer is on the loose!

有个连环杀手正逍遥法外！

I congratulated my friend on her birthday.

我女友祝贺生日。

This is conditional on the overall plan.

这决定于总的计划。

We condole with him on his loss.

我对他的损失深表同情。

She drove him on to commit murder.

她唆使他去杀人。

Shocking crimes are now on the upswing.

骇人的罪行正。

I differ with you on that point.

那一点上我意见有歧。

He lay face downwards on his bed.

他脸下伏床上。

They charge customers on an hourly basis.

他客按钟点收费。

He playea quite well on the mouth-organ.

他口琴吹得很好。

He found a purse on the road.

他路上捡到一个钱包。

They raised a query on his sincerity.

他对他是否真诚提出质疑。

Philip screwed the top on the flask.

菲利浦把颈瓶的瓶盖旋上。

She scrubbed the stain on the floor.

她把地板上的污迹擦掉了。

He prides himself on his wonderful shooting.

他为自己高超的射击技术而得意。

The pirates swept down on the town.

海盗猛烈袭击那座小城。

She turned a pirouette on the ice.

她冰上做了个单足旋转动作。

He ran a program on a computer.

他用电脑执行一个程序。

The shop sells secondhand goods on commission.

这家店代售旧货。

His prediction was right on the money.

他的预测准确无误。