硒是人体营养必需微量元素 ,具有延缓衰老、防癌抗癌、防治心血管疾病、增强机体免疫力等功能 ,文章综述了近年来国内外在这几个方面的研究进展。 Selenium is a trace element essential for human nutrition and has such functions as anti-aging, anti-cancer and anti-cancer, prevention and treatment of cardiovascular diseases and enhancement of immunity of the body. The article reviews the research progress in recent years both at home and abroad.