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人类赖以生存的大气层,无时不发生着各种不同的物理现象,真可谓风云变幻,气象万千。它不仅直接制约着地球上千万种生物的生长枯荣,而且对人类自己的种族形成也产生着重要的影响。我们知道,人种是在体质形态上具有某些共同遗传特征(如肤色、发色、发形、眼色、血型等)的人群,又称“种族”。全世界人类可分为蒙古人种、尼格罗人种和欧罗巴人种三大人种;也有根据映色来进行人种分类的,即黄色人种、黑色人种、白色人种和棕色人种等。而不同人种的特征是在一定的地域内、
The atmosphere in which human beings live depends on all kinds of physical phenomena. It can be said that the situation is changing and the weather is changing. It not only directly restricts the growth and decline of thousands of species on Earth, but also has an important impact on the human race itself. We know that people are people with certain common genetic characteristics (such as skin color, hair color, hair shape, eye color, blood type, etc.), also known as “race”. Humans in the world can be divided into three types: Mongolian, Negro, and Europa. There are also species classified by color, namely, yellow, black, white, and brown. Wait. And the characteristics of different races are in certain regions,