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爱学习的干饭王
The number of births mainly depends on habits related to marriage, and the early history of marriage is full of guidance; But we must limit ourselves to the conditions of marriage in modern civilized countries. The age of marriage varies depending on the climate. In a warm climate, childbirth starts early and ends early, while in a cold climate, childbirth starts late and ends late; But in any case, the longer the marriage is postponed after the natural age of the country, the lower the birth rate; In this regard, the age of the wife is of course much more important than the age of the husband.