如果你和外国人交朋友的唯一原因是为了提高你的英语水平，那么你可能会发现你交的外国朋友并不长久。

If your only reason for becoming friends with a foreigner is to improve your English, then you will probably find that you don't have a foreign friend for long.

youdao

但是共和党的团结可能并不长久。

However, Republican unity may not last.

youdao

我一度是他的朋友，但是并不长久。

I was his friend, but not for long.

youdao

I don't mean make it always in terms of an IPO but have a long term life.

我说的成功并不限于上市，公开募股什么的,而是让公司长久的运营下去。

斯坦福公开课 - 微软CEO-Steve.Ballmer谈科技的未来课程节选

Yes-- for a while, but not for long.

是的，更快乐一段时间并不长久。

哈佛公开课 - 幸福课课程节选