现在这个数学书只有2种,一种啊你看完第一页你就看不下去了,还有一种你看完第一句话你就看不下去了。
这句话杨在不同场合说过多次,每次表述时可能有个别字的差异。
Evolutionary psychology is not about what's unchangeable in human nature, but about what was adaptive in our ancestral environment.