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新婚夫妇了解避孕的原理,对家庭计划是十分重要的。避孕是夫妇俩暂时不想生育而采取的一种不影响房事的科学方法。由于各种避孕方法不同,因此避孕原理也不一样。下面分别
Newlyweds understand the principles of contraception, family planning is very important. Contraception is a scientific method that does not affect the sexual intercourse. Because of the different methods of contraception, contraception is not the same. Respectively