友情是人生中最美好的情感之一，而英文中也有许多简短而深刻的句子能够表达这种情感。以下是一些经典的友情句子：

1. A friend in need is a friend indeed. 患难见真情。

2. Friendship is the only cement that will ever hold the world together. 友情是唯一能够将世界紧密连结的胶水。

3. True friends are never apart, maybe in distance but never in heart. 真正的朋友永远不会分开，也许距离很远，但心始终紧贴在一起。

4. Friends are like stars, you don't always see them, but you know they're always there. 朋友就像星星，你不一定总能看到它们，但你知道它们一直在那里。

5. A true friend is someone who knows all about you and still loves you. 真正的朋友是那些了解你所有的一切，却依然爱你的人。

6. Friends are the family we choose for ourselves. 朋友是我们自己选择的家人。

7. The greatest gift of life is friendship, and I have received it. 生命中最伟大的礼物是友情，而我已经得到了它。

这些简短而经典的友情句子，不仅能够表达友情的深深情感，也能够激励我们更加珍惜身边的朋友，为友情而努力。