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本文比较了中美两国育龄妇女生育双胞胎率的差异以及与年龄的关系，指出一卵双胎率和二卵双胎率大小．不但与妇女妊娠年龄有关，而且与遗传有关．
This article compares the difference in maternal fertility rates between women of childbearing age in China and the United States, and the relationship with age, and points out the rates of one twin and two twins. Not only related to women’s gestational age, but also related to genetics.