1. When studying human populations, scientists often group people into categories such as xanthochroi and melanochroi based on their skin color.
在研究人类种群时，科学家通常根据皮肤颜色将人们分为白种人和黑种人等类别。

2. The term xanthochroi was originally used to describe people with fair or light-colored hair.
"Xanthochroi"这个词最初用来形容头发浅色或浅黄色的人。

3. Historically, some theorists used xanthochroi as a racial category to denote individuals of European descent.
历史上，一些理论家将xanthochroi视为一个种族类别，用来描述欧洲血统的个体。