他们提取了精华中的精华，然后对其稍加改动。

They've taken some of the best parts out of the best things and rehashed them.

《柯林斯英汉双解大词典》

That is the good news.The bad news is there isn't a text that fits this syllabus, so we choose readings from various sources.And the text that I have chosen is the best of a bad lot.

那是个好消息，坏消息是,没有与课程大纲对应的课本，我们从很多的资源中选取阅读材料,我选的课本不过是糟粕中的精华。

麻省理工公开课 - 固态化学导论课程节选