怀孕四周后，将会变成科瑞娜的胚胎每分钟会50万个神经细胞。
Four weeks after conception, the embryo that would become Corina was producing half a million neurons every minute.
它所经过的第一个神经细胞仅对简单刺激有反应，像是以特定角度倾斜的边线。
The first nerve cells it passes through react only to simple stimuli, such as edges slanting at particular angles.
你我大脑中有一千亿个神经细胞，神经细胞之间又有百万亿计的连接。
You and I have a hundred billion nerve cells in our brain, with a hundred trillion connections between them.
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