on

中文： 开着的、正在进行的、穿着的

1. In the state of being active, functioning or operating. · All the lights are on, so they must be home.
2. Happening; taking place; being or due to be put into action. · We had to ration our food because there was a war on.· Some of the cast went down with flu, but the show's still on.
3. Of a person, used to express agreement to or acceptance of a proposal or challenge made by that person; most commonly with subject "you" (see you're on). (informal) · "Five bucks says the Cavs win tonight." ―"You're on!"· If he wants a fight, he's on!
4. Fitted; covering or being worn. · Your feet will soon warm up once your socks are on.· I was trying to drink out of the bottle while the top was still on!
5. Of a stated part of something, oriented towards the viewer or other specified direction. · The photograph shows the UFO side on.· edge on, side on, end on, face on
6. Possible; capable of being successfully carried out. · Climbing up that steep ridge isn't on. We'll have to find another route.· He'd like to play the red next to the black spot, but that shot isn't on.
7. Available; remaining. · Smith is 25 points ahead with only 23 on.
8. Having reached a base as a runner and being positioned there, awaiting further action from a subsequent batter. (informal)