on-

A serial killer is on the loose!

有个连手正逍遥法外！

I congratulated my friend on her birthday.

我向女友祝贺生日。

This is conditional on the overall plan.

这决定于总的计划。

We condole with him on his loss.

我们对他的损失深表同情。

She drove him on to commit murder.

唆使他去人。

Shocking crimes are now on the upswing.

骇人的罪行正在增长。

I differ with you on that point.

在那一点我们意见有歧。

He lay face downwards on his bed.

他脸向下伏在床。

They charge customers on an hourly basis.

他们向顾客按钟点收费。

He playea quite well on the mouth-organ.

他口琴吹得很好。

He found a purse on the road.

他在路捡到一个钱包。

They raised a query on his sincerity.

他们对他是否真诚提出质疑。

Philip screwed the top on the flask.

菲利浦把长颈瓶的瓶盖。

She scrubbed the stain on the floor.

把地板的污迹擦掉了。

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.

在冰做了个单足转动作。

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。