Your next period may come at the expected time, early or late.

或早或晚,你的下一段时光总会如期而至.

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Keeping track of menstrual periods -- ovulation occurs two weeks before the next period.

跟踪月经周期 —— 在下次月经期前两周排卵.

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At last, this paper gave conclusions and the research direction the next period.

最后给出了本文的结论和进一步研究的方向.

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