月经 n.menstruation
例句：
1.绝经期来临之前的长时间闭经和月经未来也会增加骨质疏松的风险。
Prolonged periods of amenorrhea, the absence of menstruation, before menopause also increases the risk of osteoporosis.
2.例如，你可能会认为，女人来月经时不应该做饭,因为这样会亵渎了食物。
You might believe for instance, that women should not prepare food when menstruating because it would contaminate the food.
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