详细介绍：It seems simple: an egg + sperm = one embryo. But if your sperm is "few, vague and abnormal" and your woman is…
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简介：<p>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.</p>…