as we all know还是known

是as we all know，as是连词，后接句子，而as we all known中known是过去分词不能做谓语，不是句子。

as we all know 众所周知；正如我们所知；

But as we all know, of all these alternative fuel vehicles, the most practical are electric vehicles.

但我们都知道，在所有可以替代燃料汽车的选择中，最实际的是电动汽车。

Stratford-on-Avon, as we all know, has only one industry—William Shakespeare—but there are two distinctly separate and increasingly hostile branches.

我们都知道，斯特拉福镇只有一个产业——威廉·莎士比亚，但这里有两个泾渭分明、而且越来越敌对的群体。

As we all know, the "rice bowl" culture of China has influenced some Asian countries such as Japan, Korea and Vietnam since we started to use chopsticks while eating food.

众所周知，自从我们开始使用筷子吃饭以来，中国的“饭碗”文化已经影响了一些亚洲国家，如日本、韩国和越南。

As we all know, no one is perfect.

我们都知道，没有人是完美的。

As we all know, the computer is a marvelous machine.