但是有没有完美的操作系统呢？

But is any operating system perfect?

youdao

没有理想；没有完美。

There is no ideal; there is no perfect.

youdao

有数不清的人没有完美的家庭。

There are thousands of people who do not have wonderful families.

youdao

And what that corresponds to, if you recall, is the idea that in a perfect crystal at zero degrees Kelvin then you have no disorder at all.

如果你们能回忆起来的的话，这就意味着,绝对零度下的完美晶体,一点无序状态也没有。

麻省理工公开课 - 热力学与动力学课程节选

Can't have told that perfectly that story I'm sure so any questions?

我觉得我没有把这个事情讲得很完美,那么有什么问题吗？

哈佛公开课 - 计算机科学课程节选

It's never perfect and we can't figure out yet a way to make it perfect and we still have small investors who are defrauded, who are treated badly.

事无完美,至今还没有完美的办法,仍然有许多小投资者,遭受欺诈,成为受害者

耶鲁公开课 - 金融市场课程节选