妇女的平均月经周期是28天。
有些女孩初次排卵可能甚至早于她们的月经。
清瘦、训练艰苦的女运动员行经可能不那么频繁或根本没有月经。
Lean, hard-training women athletes may menstruate less frequently or not at all.
女士在月经期间应该选用干净、柔软的软布或卫生巾。
Women, during menstruation, should use clean, soft cloth or sanitary napkins.
出口也许是随后的6至12个月经济中的惟一强项。
Exports may be the only strong point in the economy over the next six to 12 months.
月经（例假）的来到是女孩青春期中经历的一个重要阶段；它是女孩变为女人的众多生理变化之一。
Menstruation (a period) is a major stage of puberty in girls; it's one of the many physical signs that a girl is turning into a woman.
“经期间痛”这个词来自于德语中的“中间”和“疼痛”两个词，由于它发生在两次月经之间。
This is called mittelschmerz from the German words for "middle" and "pain" because it occurs mid-cycle.
“经期间痛”这个词来自于德语中的“中间”和“疼痛”两个词，由于它发生在两次月经之间。
This is called mittelschmerz from the German words for "middle" and "pain" because it occurs mid-cycle.
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