What isthe definition of infertility according to the demographers?
Definition of infertility differ, with demographers tending to define infertility as childlessness in a population of women of reproductive age.
举一反三
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What is the definition of “meter”?
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What is the definition of diphthongs?
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What is the definition of inquiry?
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What isthe structure of a typical business report?
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What is the definition of transverse metacenter?（）