Even before a woman knows she's pregnant, the placenta swells in size, poised to serve as the fetus's kidneys and liver until the fetus has its own. The placenta starts to “breathe” for the fetus around 12 weeks in. Over a convoluted surface that grows large enough to cover a horse, fetal blood on one side soaks up oxygen from mom's blood on the other. Her oxygen flows seamlessly into the fetus's beating heart, brain, and limbs, and carbon dioxide from the fetus returns to the mother's blood, to be exhaled in her breath.

中文翻译：

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人工子宫是科幻小说：但人工胎盘即将出现

甚至在女人不知道自己怀孕之前，胎盘的大小就会膨胀，准备充当胎儿的肾脏和肝脏，直到胎儿拥有自己的胎儿为止。胎盘在大约12周内开始为胎儿“呼吸”。在一个弯曲的表面上长得足以覆盖一匹马，一侧的胎儿血液从另一侧的母亲的血液中吸收了氧气。她的氧气无缝地流入胎儿跳动的心脏，大脑和四肢，并且胎儿的二氧化碳返回母亲的血液，被呼出。