To cohabit is to live with someone as a couple, including a sexual relationship, without being married. It is a calm, rather official word: you find it in law, news, and sociology, not in a love song.

to cohabitTo cohabit is to live with someone as a couple的意思是以伴侶的身分跟人一起生活，including a sexual relationship包含性關係在內，without being married但沒有結婚。it is a calm, rather official word這是個平和、偏公文的字：you find it in law, news, and sociology你會在法律文件、新聞、社會學裡看到，not in a love song不會出現在情歌歌詞裡。

In ordinary talk people say they live together. The usual pattern is cohabit with someone.

in ordinary talk在一般對話裡，people say大家會說 they live together『they live together』。the usual pattern is常見的用法是 cohabit with someone『cohabit with someone』。

This sense is about partners, not about sharing a flat with a friend or a brother; roommates are not cohabiting in this meaning, even if they share a kitchen.

this sense is about partners這個意思講的是伴侶關係，not about sharing a flat with a friend or a brother不是跟朋友或兄弟合租房子；roommates are not cohabiting in this meaning室友之間不算是這個意義上的cohabiting，even if they share a kitchen就算共用廚房。

The word used to sound more judging than it does now. Today many writers use it as a plain fact about how people live.

the word以前這個字 used to sound more judging聽起來比較帶批判意味 than it does now比現在更嚴重。today今天，many writers use it很多作者拿它 as a plain fact about how people live當成陳述生活方式的平淡事實。

There is a wider, rarer use — two groups or animals living in the same place — but the meaning you will be tested on is the unmarried couple.

there is a wider, rarer use還有一個更廣、比較少見的用法——two groups or animals living in the same place指兩個群體或兩種動物住在同一個地方——but the meaning you will be tested on但你考試會考的意思 is the unmarried couple是沒有結婚的伴侶這個用法。