Improv is the short, everyday word for making a performance up as you go: acting, singing, or playing music without a script you learned first. Comedy clubs and drama classes use it all the time; jazz players do a kind of improv too.

ImprovImprov is the short, everyday word for making a performance up as you go是日常裡簡短的說法，指邊做邊演、當場編出來的表演：acting, singing, or playing music演戲、唱歌，或演奏音樂，without a script you learned first不是先背好的劇本。Comedy clubs and drama classes喜劇俱樂部和戲劇課use it all the time一直都在用這個字；jazz players do a kind of improv too爵士樂手也會做一種improv。

People also say 'to improv' in casual speech, meaning to invent the next line on the spot. The longer, more formal cousins are improvise and improvisation.

People also say 'to improv' in casual speech大家在口語裡也會說『to improv』，meaning to invent the next line on the spot意思是當場編出下一句台詞。The longer, more formal cousins比較長、比較正式的親戚字are improvise and improvisation是improvise和improvisation。

Though actually, good improv is not empty luck. Players train hard, and they follow simple rules, like saying yes to a partner's idea and adding to it.

Though actually不過其實，good improv is not empty luck好的improv不是空有運氣。Players train hard表演者會認真訓練，and they follow simple rules而且會遵守一些簡單的原則，like saying yes to a partner's idea and adding to it像是接受夥伴的點子並繼續往下加。

The word is informal. You would not put it in a very serious essay unless you were writing about theatre.

The word is informal這個字是非正式的。You would not put it in a very serious essay你不會把它用在很正式的文章裡，unless you were writing about theatre除非你正在寫跟戲劇有關的東西。