虚拟化并不是什么新主题；实际上，它的存在已经超过40 年了。

Virtualization is not a new topic; in fact, it's over four decades old.

youdao

空气污染问题已经不是什么新鲜事了，这一问题持续存在了数年。

The problem is not new and has been ongoing for a number of years.

youdao

所以说，一个好的领导不仅仅满足于关心什么缉福光凰叱好癸瞳含困已经存在。

So, a good leader is not satisfied with the care what already exists.

youdao

已经存在的理论与原则是什么？

What are the existing theories or principles?

youdao

已经存在的理论与原则是什么？

What are the existing theories or principles?

youdao