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On about day 14 of the cycle, the follicle ruptures and releases the egg cell. This is ovulation. After ovulation the egg is trapped by the oviduct and transported to the uterus. The uterine endometrium continues to develop, preparing to receive a fertilized egg cell. If the egg cell is not fertilized, it degenerates.
在大約月經(jīng)周期的第14天，卵泡破裂排出卵子。這個過程叫做排卵。排卵后卵子被輸卵管捕捉，運送到子宮。子宮內(nèi)膜繼續(xù)增厚，為迎接受精卵著床做準備。如果卵子沒有受精，卵子會退化。
The uterine endometrium is sloughed off and discharged through the vagina, along with the degenerated egg and a small amount of blood. If the egg is fertilized, which usually occurs between day nine and day 15—the period of highest fertility, the embryo starts to implant in the endometrium. The cycle is stopped and menstruation does not occur.
子宮內(nèi)膜脫落，和退化的卵細胞、少量血液一起通過陰道排出。如果卵子受精（通常發(fā)生在月經(jīng)周期的第9天到第15天之間，這是最容易受孕的時間段），胚胎開始在子宮內(nèi)膜上著床，月經(jīng)周期停止，不會再發(fā)生。
Once it is implanted in the endometrium, the embryo secretes human chorionic gonadotropin (HCG). This sustains the corpus luteum, which continues to secrete progesterone and estrogen.
一旦在子宮內(nèi)膜上著床，胚胎分泌絨毛膜促性腺激素HCG。HCG維持著黃體，黃體持續(xù)分泌雌激素和孕激素（維持妊娠）。
