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截止2011年10月31日,全球已有70亿人口。而在自然资源日益紧张的今天,人口的过快增长被认为将制约环境、资源、社会、经济的协调发展和可持续发展。因此,稳定生育水平,控制人口数量、提高人口质量和全民健康水平任重而道远。而解决人口难题的关键在于采取切实可行的避孕节育措施。自20世纪初以来,科研人员已研制出多种避孕方法,如放置宫内节育器(intrauterine device,IUD)、
As of October 31, 2011, there are already 7 billion people in the world. Today, with increasingly tense natural resources, the excessive growth of the population is believed to restrict the coordinated development and sustainable development of the environment, resources, society and economy. Therefore, it is a long way to go to stabilize the level of fertility, control the population, improve the quality of the population and the health of the general public. The key to solving the population problem lies in practicing contraceptive measures. Since the early 20th century, researchers have developed a variety of contraceptive methods, such as intrauterine device (IUD)