1970年总生育率为4.45，世界上一般家庭都会有四到五个孩子。
In 1970 the total fertility rate was 4.45 and the typical family in the world had four or five children.
生育率是平均女性在生育年龄(一般来说是15岁到49岁)生育的小孩数。
Rather, it represents the number of children an average woman is likely to have during her childbearing years, conventionally taken to be 15-49.
生育率是平均女性在生育年龄(一般来说是15岁到49岁)生育的小孩数。
Rather, it represents the number of children an average woman is likely to have during her childbearing years, conventionally taken to be 15-49.
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