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避孕用品的原理是什么？-NWHunter

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TED-Ed
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观看完整课程: http://ed.ted.com/lessons/how-do-contraceptives-work-nwhunter 避孕药有三种主要的方式避免怀孕：人们要么阻止精子，在精子到达输卵管前失去活性...

بیشتر نشان بده، اطلاعات بیشتر
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تا بعدی


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