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随着人类计划生育事业的进步,现有避孕药具种类已有了很大发展。但由于各种避孕方法均有局限性,任何一种避孕方法都有失败的可能。全世界每年约有800—3000万妊娠是由避孕失败造成的,约有500万非意愿妊娠需通过人工流产终止妊娠。世界卫生组织有一项统计表明,仅在不发达国家,每年大约有20万妇女死于人工流产,不安全流产已成为当前急待解决的问题。
With the progress of human family planning, the types of contraceptives available have greatly developed. However, because of the limitations of various methods of contraception, any method of contraception may fail. About 8 to 30 million pregnancies worldwide are caused by contraceptive failure each year, and about 5 million unwanted pregnancies require termination of pregnancy through abortion. WHO statistics show that in only the underdeveloped countries, about 200,000 women die each year due to induced abortion, and unsafe abortion has become an urgent issue to be solved.