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.
凯瑞·克劳利,布里德·布伦南,Eva-Jane Gaffney,肖恩·T·O·米尔莱,Marcus Lamb,阿特·帕金森,Naseen Morgan,Niall Mac Eachmharcaigh,Brid Ní Chumhaill,Christopher Grant,Eoghan Mac Giolla Bhrighde