1.friendship的基本意思是“友情,友谊”,可以指小到人与人之间的“友情”,也可指大到国与国之间的“友谊”。
2.friendship一般用作不可数名词,但表示具体的或一段“友谊”或“友情”时,可用作可数名词。

My friendship with them grew to be considerable.我与他们之间的友谊渐增。
To me, our friendship is a very precious thing.对我来说,我们之间的友谊是非常珍贵的。
True friendship should last forever.真实的友谊应永恒不渝。
I valued my friendship with my classmates.我珍视我和同学之间的友谊。
He held out his hand in friendship.他伸出了友谊之手。
Nothing will interfere with our friendship of course.当然没有什么能够妨碍我们的友谊。
The organization works to promote friendship between nations.该组织旨在促进各国之间的友谊。
We are bound to him by a close friendship.亲密的友谊使我们与他的关系密切。
His friendships never last very long.他的友好行为从未持续长久。
Tom and I have maintained our friendship for twenty years.我和汤姆的友谊已持续了20年之久。

下面两句意思不同:
I have a friendship for him.
我对他有好感。
I have a friendship with him.
我与他有交情。

［同义词］   brotherhood, comradeship
［反义词］   enmity