知识的英文可数吗

例句：

1、We do not have His Knowledge and Understanding!

我们没有他的知识和理解！

2、They do it without the knowledge or help of their parents.

这样做既不让父母知道也不要父母的帮助。

3、"We have the knowledge to answer many of these questions",he said.

“我们拥有知识对这些问题中的许多作出解答，”他说。