“sex ratio at birth”的概念、定义、翻译、参考文献-科学参考

单词	sex ratio at birth
释义	sex ratio at birth Encyclopedia 法学生育率释 sex ratio at birth出生性别比在特定的时间和空间范围内出生时的活产男婴数与活产女婴数之比。又称出生人口性别比、第一性别比。
随便看	Barbarians in the garden barbarian tribes barbaros Barbary Wars barbary wolfberry fruit Barbashin-Krasovskii theorem barbated skullcup herb barbator barbecue restaurant Barbe length curve barbels barber paradox barberry family barberry root Barberton daisy barbertonite Barbican Centre barbicel Barbier Barbier crater Barbier degree Barbier theorem barbinae barbiturate barbituric acid

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