人的身体和内脏功能基本上是相同的，然而，在人种或人群之间，却存在着某些奇妙的、耐人寻味的差异。黑人比白人耐热深肤色人种的调节体温能力较浅肤色人种强，黑人比白人耐热，更能适应热带生活。我们知道，肤色的变异在地球分布上是有规律性的：非洲人比欧洲人的肤色深，南 The functions of the human body and internal organs are basically the same. However, there are some wonderful and intriguing differences between the races or the people. Blacks are more heat- and dark-skinned than whites, and they are more capable of regulating body temperature than people with lighter skin. Blacks are more heat-resistant than whites and are more adaptable to tropical life. We know that the variation of skin color is regular in the distribution of the earth: Africans have darker skin than Europeans, and