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过去的许多文献曾提出一个严峻的问题 :在世界范围内 ,无论动物还是人类的精子数量都在下降。工业和环境污染物如雌激素、热、各种化学物品以及电子和辐射能对生殖系统都有损害。美国国家职业健康研究所 (ＮＩＯＳＨ )和ＨｅａｌｔｈＲｅｇｉｓｔｒｙｏｆＴｏｘｉｃＥｆｆｅｃ
Many articles of the past have raised a serious problem: the number of sperm in animals and humans in the world is declining. Industrial and environmental pollutants such as estrogen, heat, various chemicals and electronics and radiation can damage the reproductive system. National Institute of Occupational Health (NIOSH) and Health Registry of ToxicEffec