Takes one to know one; so, you can't be a Canadian and study Mexicans, because it takes one to know one.

同类才能互知,所以加拿大人就不能研究墨西哥人,因为只有同类才能互知

耶鲁公开课 - 死亡课程节选

Of course the Canadians can study the Mexicans and the Germans can study the French.

加拿大人当然可以研究墨西哥人,德国人也可以研究法国人

耶鲁公开课 - 死亡课程节选