translation.en: I think it's probably the case that, in the human evolutionary lineage, even before there were homo sapiens, feelings like compassion and love and sympathy had earned their way into the gene pool, and biologists have a pretty clear idea of how this first happened.
translation.zh: 我想这可能是这样，在人类的演化谱系， 甚至比智人出现的更早， 同情心、爱和怜悯的感觉 已经找到了进入基因库的方式， 并且生物学家对它最初的出现已经有了很清晰的想法。