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The menstrual cycle involves rhythmical changes in the ovaries and uterus that prepare the female for pregnancy. The cycle lasts an average of 28 days. It is regulated by four hormones—follicle-stimulating hormone (FSH), luteinizing hormone (LH), estrogens and progesterone.
月經周期是（因為）卵巢和子宮為（女性）準備受孕而發生的節律性改變。這個周期持續平均28天。它由四種激素調節：卵泡刺激素，黃體生成素，雌激素和孕激素。
The first day of menstruation marks the first day of the menstrual cycle. It begins with the shedding of the uterine endometrium. The tiny capillaries of the endometrium rupture and blood together with dead endometrial cells is discharged through the vagina. Then a follicle with an egg cell inside it gradually matures in the ovary. The uterine endometrium begins to build up again. It gradually becomes thicker and softer.
月經的第一天標志著月經周期的開始，它以子宮內膜流血開始。子宮內膜的小毛細血管破裂，血和死亡的內膜細胞一起通過陰道排出。然后內有卵細胞的卵泡開始在卵巢內逐漸發育成熟。子宮內膜開始重新建立，變得越來越厚，越來越軟。
