Human chorionic gonadotropin (hCG) is a heterodimeric glycoprotein hormone produced and secreted by syncytial trophoblast, which plays a central role in the establishment of pregnancy.是什么意思_Human chorionic gonadotropin (hCG) is a heterodimeric glycoprotein hormone produced and secreted by syncytial trophoblast, which plays a central role in the establishment of pregnancy.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句