The external differences that most people would use in defining race--skin color, eye shape, height--are genetically inconsequential, minor variations that evolved in response to the environment, the genetic equivalent of a sunburn.

• 人们用来定义种族的外在差异如肤色、眼形、高矮等等从遗传学角度上看是无关紧要的，而像对环境的反应、日晒遗传的等效性次要变异才是重要的。