1. In terms of knowledge, college students in the 1970s were exposed to a relatively narrow range of knowledge and covered less content. College students in the 1980s are more knowledgeable than those in the 1970s. In the 1990s, college students were exposed to a wider range of knowledge and covered more contents.

2. From the depth of knowledge, the post-90s college students have a deeper understanding and mastery of knowledge than the post-70s and 80s college students. Because the post-90s college students are more advanced in academic knowledge and technology, and their learning conditions and resources are richer than before, their knowledge may be higher.

Generally speaking, in terms of knowledge and depth, the knowledge level of post-90s college students is relatively high.