例句：
The new librarian is a friend of mine.
这位新来的图书管理员是我的朋友。
He's more than a coach, he's a friend.
他不只是个教练，还是个朋友。
We met at the home of a mutual friend.
我们在彼此都认识的朋友家中会面。
I walked across Scotland with a friend.
我和一个朋友徒步穿越了苏格兰。
Mercifully, a friend came to the rescue.
很幸运，一个朋友赶来解救了。