She also had comprehensive knowledge of many subjects. The young man decided to go and visit her.

她也懂很多其他的知识。这个年轻人决定去拜访她。

If applied to some other topic, it would mean a complete or comprehensive knowledge of that topic.

如果应用于其他主题，则意味着对该主题有完整或全面的了解。

We could talk about the " science of running" or the " science of podcasting" – if we thought that these were areas where you would have very specific and comprehensive knowledge about a certain topic.

我们可以谈论“跑步的科学”或“播客的科学”——如果我们认为这些是您对某个主题具有非常具体和全面的知识的领域。