a steroid hormone,C21H30O2,secreted by the corpus luteum of the ovary and by the placenta,that acts to prepare the uterus for implantation of the fertilized ovum,to maintain pregnancy,and to promote development of the mammary glands是什么意思_a steroid hormone,C21H30O2,secreted by the corpus luteum of the ovary and by the placenta,that acts to prepare the uterus for implantation of the fertilized ovum,to maintain pregnancy,and to promote development of the mammary glands在线翻译_英语_读音_用法_例句