1. friendship goals 令旁人羡慕的深厚友情

Leo and Kate are the epitome of friendship goals.

小李和凯特拥有最令人羡慕的深厚友情。

2. fast friends 挚友

The two of them had been fast friends since college.

他俩从大学起一直是挚友。

3. birds of a feather 合拍的人，意气相投的人，习惯、嗜好相同的人

He'll like ​Tony - they're ​birds of a ​feather.

他会喜欢托尼的——他们两个有许多相似之处。

4. be (as) thick as thieves 亲密无间，非常友好

I'm sure she tells Ruth everything we say - they're as thick as thieves.

我相信她会把我们所说的一切都告诉露丝——她们关系非常亲密。

5. joined at the hip 死党

Those two are joined at the hip. They are always together.

他俩就像连体婴似的，总是一块儿出现。

6. paths cross 遇见，相遇

It was a pleasure meeting you - I hope our paths cross again.

很高兴见到你——我希望我们能再次见面。

7. strike up a friendship 做起朋友来，开始建立友谊

I struck up a friendship with John while we were on a business trip together.

一同出差后，我和约翰建立起了友谊。

8. fair-weather friend 酒肉朋友，不能共患难的朋友

A fair-weather friend isn't much help in an emergency.

酒肉朋友在你最需要他们的时候是帮不上什么忙的。

9. 最后再送大家一句谚语：

A hedge between keeps friendship green.

君子之交淡如水。