肤色歧视英语作文

人的皮肤像一面镜子,反映人的生命活力和健康状况.健康状况不同的人,肤色有所差异,而不同人种的肤色有极明显的差异.黄种人的肤色淡黄；黑种人的肤色黝黑；白种人的肤色则是浅淡色.那么,世界上为什么会有不同肤色的人种呢?皮肤的颜色主要是由皮肤内黑色素的多少决定的.黑色素是一种黑色或棕色的颗粒,其主要作用是阻挡阳光中紫外线对人体皮肤下面细胞的伤害.阳光较强时,黑色素的含量增多,所以,夏天我们会被晒黑.人类皮肤的颜色,是进化过程中适应自然的结果.居住在赤道地区的非洲人,由于皮肤常常受到强烈 日光照射,体内黑色素大量产生,所以,非洲人皮肤呈黑色.在高寒地少,所以,皮肤为白色.黄种人一般聚居在温带地区,阳光强烈的程度居中,黑色素也介于二者之间,所以皮肤的颜色也介于两种人之间.科学家经研究发现,人类的祖先在一开始并没有差异,肤色基本相同. The skin is like a mirror, reflecting people's vitality and health. The health status of different people, different color, different kinds of color and have obvious difference. The yellow color yellow; black dark skin; white complexion is pale. Then, the world why are there different skin color? The main color of the skin is determined by how much the skin melanin. Melanin is a kind of black or brown particles, its main function is to block the sun's ultraviolet on human skin cells following injury. The sunshine is strong, the melanin content increased, so in summer we will tan. Human skin color, is a natural result of adaptive evolution. Living in the equatorial region of the Africans, because the skin is often affected by the strong sunlight, melanin production, so that the skin of Africans Skin is black. In the alpine, so skin is white. Yellow is generally live in temperate regions, center of strong sunlight, melanin is situated between the two, so between skin color between two people. Scientists in the study found that, human ancestors in beginning and there is no difference, color of skin is basically the same.