We put cum between two nouns to show that one thing does two jobs at once. A kitchen-cum-dining-room is one room that is both a kitchen and a place to eat. A writer-cum-teacher is one person who writes and also teaches.

We我們 put cum between two nouns把cum放在兩個名詞中間 to show表示 that one thing does two jobs at once同一個東西同時做兩份工作 A kitchen-cum-dining-room廚房兼餐廳（kitchen-cum-dining-room） is one room就是同一個房間 that is both a kitchen and a place to eat既是廚房也是吃飯的地方 A writer-cum-teacher作家兼老師（writer-cum-teacher） is one person就是同一個人 who writes and also teaches既寫作也教書

English borrowed the word from Latin, where it meant "with".

English英文 borrowed the word from Latin把這個字借自拉丁文 where it meant "with"在拉丁文裡意思是"with"（和……一起）

You will mostly meet it in writing; it feels a little formal or clever, and people do not often drop it into easy chat. Though actually, we almost never use it as a free joining word any more — we glue it between two nouns, usually with hyphens.

You你 will mostly meet it in writing大部分會在文字裡遇到它 it它 feels a little formal or clever感覺有點正式、有點文謅謅 and people do not often drop it into easy chat人們不太會把它用在輕鬆的聊天裡 Though actually不過其實 we almost never use it as a free joining word any more現在幾乎不會把它當成自由的連接詞單獨用 we我們 glue it between two nouns會把它黏在兩個名詞中間 usually with hyphens通常還加上連字號

Say it like come. The same spelling is also a very rude slang word for something sexual, so in school or work writing this "two jobs" sense is the one you want, and the two nouns plus the hyphens are what keep it clear.

Say it like come唸法跟come一樣 The same spelling同樣的拼法 is also a very rude slang word也是一個很粗俗的俚語 for something sexual指性方面的事 so in school or work writing所以在學校或工作的寫作裡 this "two jobs" sense is the one you want你要的是這個「兼」的意思 and the two nouns plus the hyphens而兩個名詞加上連字號 are what keep it clear就是讓意思清楚的關鍵