最后，它打印所需的不同细胞层——所有这些只需要不到一个小时。
Finally, it prints the layers of different cells needed-all in less than an hour.
脊髓只有不到两英尺长，它的直径也只相当于你的食指粗细，但是在它之中有超过一百亿的神经元细胞。
The spinal cord is less then two feet in length and is the same diameter as your index finger, yet it contains over 10 billion nerve cells.
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