Meanwhile, the now-empty follicle begins to release progesterone, another hormone that tells the womb's lining to plump up with blood and nutrients, in preparation for a fertilized egg that may embed there and grow.

与此， 排空卵子卵泡开始分泌黄体素，这是一种告知子宫内膜充盈血液和营养激素，为可能在此着并成长受精卵做好准备。

If it doesn't embed, a few days later the body's progesterone and estrogen levels plummet, meaning the womb stops padding out and starts to degenerate, eventually falling away.

如果卵子没有成功着， 后体内黄体素和雌激素水平会急剧下降，这意味着子宫内膜停止增厚并开始退化，最终脱落。