But if you wanted to know it You could, you would look at development and you'd watch the embryological development of a zebra and that's how you would learn the answer to your question.

但如果你想要知道答案,你就应当去观察斑马的发育过程,观察斑马的胚胎发育,这就是寻找该问题答案的方法

耶鲁公开课 - 心理学导论课程节选