brain cells 测验

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• 问题 1 :
Scientists have grown miniature human brains in test tubes, creating a "tool" that will allow them to watch how the organs develop in the womb and, they hope, increase their understanding of neurological and mental problems. ¶ Just a few millimetres across, the "cerebral organoids" are built up of layers of brain cells with defined regions that resemble those seen in immature, embryonic brains.
1. brain cells
2. brain cell
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