A short, casual way of saying "vocabulary" — the set of words a person knows, or the list of words you are studying. Students and teachers use it all the time: "today's vocab", "a vocab test", "I need to work on my vocab".

A short, casual way of saying "vocabulary"是「vocabulary」的簡短口語說法—— the set of words a person knows指一個人會的那些字， or the list of words you are studying或是你正在學的單字表。 Students and teachers use it all the time學生和老師成天都在用： "today's vocab", "a vocab test", "I need to work on my vocab"「today's vocab今天的單字」、「a vocab test單字小考」、「I need to work on my vocab我需要加強我的單字」。

It is not a formal word. You would say it to a classmate or write it in your notebook, but in a school report or an academic paper you would write the full word "vocabulary".

It is not a formal word這不是正式的字。 You would say it to a classmate or write it in your notebook你會對同學說，或寫在自己的筆記本裡， but in a school report or an academic paper但在學校報告或學術論文裡， you would write the full word "vocabulary"你會寫完整的「vocabulary」。

It has no plural in normal use — people say "lots of vocab", not "lots of vocabs", because it behaves like a mass of stuff rather than countable things. Note that it usually points at the words themselves, so "a vocab list" and "my vocab is small" both work, but you do not use it for the study of words as a subject.

It has no plural in normal use它平常沒有複數形—— people say "lots of vocab", not "lots of vocabs"大家會說「lots of vocab很多單字」，不說「lots of vocabs」， because it behaves like a mass of stuff rather than countable things因為它的用法像一整團東西，不是可以一個個數的東西。 Note that it usually points at the words themselves要注意，它通常指的是那些字本身， so "a vocab list" and "my vocab is small" both work所以「a vocab list單字表」和「my vocab is small我會的字不多」都說得通， but you do not use it for the study of words as a subject但你不會用它來指「單字研究」這門學科。

One more thing worth saying: outside school, ordinary adults do use it too, mostly when talking about learning a language or joking about someone's fancy words.

One more thing worth saying還有一件值得一提的事： outside school, ordinary adults do use it too在學校之外，一般大人也會用這個字， mostly when talking about learning a language多半是在講學語言的時候， or joking about someone's fancy words或是拿別人愛用的花俏字彙開玩笑。