on

在…上、在…上面

Someone left a wet umbrella on the kitchen table.

有人把一把湿伞留在厨房桌子上。

在（某日）、于

The results will be announced on Friday afternoon.

结果将在星期五下午公布。

关于、有关

She gave a short talk on renewable energy.

她针对再生能源做了简短的演讲。

透过、在…上

I heard the news on the radio this morning.

我今天早上从广播上听到这个消息。

处于（某状态）、在…中

Half the staff are on leave this week.

这星期有一半的员工在休假。

属于（团体）、任职于

He has been on the committee for three years.

他已经在委员会待了三年。

服用、使用（药物）

She is on painkillers until the swelling goes down.

在肿消之前她都要服用止痛药。

靠、以…为动力

These old buses still run on diesel.

这些旧公车仍然靠柴油行驶。

临、位于

Their apartment is on a quiet side street.

他们的公寓位在一条安静的巷子里。

由…付帐、请（客）口语

Order whatever you like; dinner is on me.

想吃什么就点，这顿晚餐我请。

继续、持续、下去

He talked on for another twenty minutes without pausing.

他又不停地继续讲了二十分钟。

穿上、戴上

Put your jacket on before you go outside.

出门前先把外套穿上。

向前、往前

We walked on until the path disappeared.

我们一直往前走，直到小路消失。

开著的、运转中的

The heater has been on all night.

暖气开了一整晚。

照计划进行、举行

Is the meeting still on, or did they cancel it?

会议还是照原定进行吗，还是取消了？