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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.。来自尼日利亚西南部一个村子的四名青少年无意中发现一袋未切割的钻石，但很快就有一群人前来寻找这笔财富。。