Today's methods of birth control make it possible for a couple to choose whether or not to have a child.
如今的节育措施使一对夫妇可以选择是否要生育孩子。
The first cause of the liberation of women was the development of effective birth-control methods, freeing women from the endless cycle of childbearing and rearing.
妇女的解放首先起因于有效的节育措施的出现，从而将女人从生养孩子的无尽循环中解放出来。
So you're probably not going to tell a 13-year-old necessarily all about different methods of birth control.
因此你可能不必告诉一个13岁的孩子关于生育控制的所有不同的方法。
About one-third of adolescents hadn't received instruction on methods of birth control before age 18.
青少年中有大约三分之一在18岁前没有接受过关于节育控制方法的教育。
Methods: Intervention modeling was carried out on 1075 perinatals (317 cases with birth defects, 758 cases without birth defects as control) born in Guangxi province in 2000 with COX regression model.
方法采用COX回归模型对广西2000年出生的围产儿1075例(包括出生缺陷儿317例和正常对照儿758例)进行干预模式拟合。
Methods 200 cases pregnant women of single birth, occipital presentation and without complication were randomly divided into overview group and control group, and each group had 100 cases.
方法选择单胎枕先露、无严重并发症及合并症的孕妇200例，随机分为观察组和对照组，每组各100例。
Methods 200 cases pregnant women of single birth, occipital presentation and without complication were randomly divided into overview group and control group, and each group had 100 cases.
方法选择单胎枕先露、无严重并发症及合并症的孕妇200例，随机分为观察组和对照组，每组各100例。
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