These cells know which signal to send because they receive light input from our environments - bright says wake, dark says sleep.
这些细胞知道该打什么信号，因为它们从环境中接收到光线刺激，明亮时就表示人该醒着，昏暗时就该睡觉。
These cells know which signal to send because they receive light input from our environments - bright says wake, dark says sleep.
这些细胞知道该打什么信号，因为它们从环境中接收到光线刺激，明亮时就表示人该醒着，昏暗时就该睡觉。
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