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1. www.doctoryang.info › note_detail<分享>國外介紹懷孕醫學知識的網站 - Dr. Yang 楊麗姝中醫 ...

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   How does a man's reproductive system work ? Chapter 2c: How Babies are Made - The Basics What happens during ejaculation ? How does testosterone affect male fertility ? Chapter 2d: How Babies are Made - The Basics What happens to the sperm once ...