A well-read person has read a lot of books and has learned a lot from them.

这个句子是对柯林斯词典对 well-read 的解释。感觉这个 well-read 是表示主动意义，而不是被动意义，与下面的用法不同（下面的过去分词均表示“被动”意义）：

This is a well-written and readable introduction to the subject of linguistics. 这篇对语言学科的介绍写得很好，可读性很强。

He was promoted after leading a well-managed division for several years. 在领导一个管理完善的部门好几年之后，他获得升迁。

Dave amazed his friends by leaving a well-paid job to travel around the world. 戴夫辞去一份高秦的工作去周游世界，这令他的朋友大为吃惊。

Her husband is a well-known novelist, but she is a successful writer in her own right. 她丈夫是一位知名小说家，而她本身也是一位成功作家。