It seems simple: an egg + sperm = one embryo. But if your sperm is "few, vague and abnormal" and your woman is premenopausal at age 37, things start to get complicated.
喜剧片 / 美国
喜剧片 / 大陆
喜剧片 / 香港
喜剧片 / 日本
喜剧片 / 西班牙