正文：The men strual cycle is the wheel that drives humanity. To make human reproduc needs to have a highly specialized bio logy that can be repeatedly hortion work, half the population monally rewired for a potential pregnancy, as well as bleed hundreds of times and each time repair itself without scar tissue. And while biologically this is an evolutionary mar vel, it’s also a source of aggrava tion, pain and suffering for many, because retrofitting a body for a potential pregnancy and then bleeding for several days 400 or so times over a lifetime can have medical consequences.

知识点：menstrual adj.

connected with the time when a woman menstruates each month月经的

The average length of a woman's menstrual cycle is 28 days.妇女的平均月经周期是28天。

a menstrual period月经期

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