Give some personal advice. . . Idealism and realism are defined by common sense, so I won't discuss them for the time being. . . The exchange here is valuable, so here I personally understand value as worth cherishing. So what is precious? As the saying goes, things are rare. So doing such a treatment here, what is more valuable here is not equal to being more useful but rarer. Of course, this scarcity should be legitimate things, such as theft, decadence and other derogatory things, and we can not discuss it because it has no value and legitimacy. So more specifically, here we compare two valuable measurement methods based on legitimacy, one is the comparison in quantity and the other is the comparison in quality. Therefore, if it is a square, then making a valuable and useful concept cut shows that being useful and valuable does not mean being valuable. Paying attention to the background description shows that the realism of contemporary college students is growing, idealism has lost its position, and the ivory tower has become a training camp. It is because of the heavy pressure of reality that we can better understand it.