understanding of or information about a subject that you get by experience or study, either known by one person or by people generally

Her knowledge of English grammar is very extensive. 她的英语语法知识很广博。

He has a limited knowledge of French. 他对法语所知有限。

The details of the scandal are now common knowledge (= familiar to most people). 丑闻的详情现在众所周知。

She started to photograph the documents, safe in the knowledge that (= knowing that) she wouldn't be disturbed for at least an hour. 她开始对文件拍照，确信至少一小时内不会有人打扰。

In this town there are only a couple of restaurants that to my knowledge (= judging from my personal experience and information) serve good food. 据我所知，这个镇上只有几家餐馆菜品不错。

the state of knowing about or being familiar with something

They both deny all knowledge of the affair. 他们俩完全否认知道此事。

It has come/been brought to our knowledge (= we have discovered) that several computers have gone missing. 我们发现有几台电脑不见了。