“绝大部分”的意思是几乎所有的、大多数的东西或人，比“大部分”更强调数量非常多。

The meaning of "绝大部分" is almost all or most things or people, emphasizing a very large quantity more than "大部分".

我们常用它来说明一件事里最多、最主要的那一部分。

We often use it to indicate the largest and most important part of something.