The circadian rhythm in mammals is regulated by two clusters of nerve cells called the suprachiasmatic nuclei (SCN) in the anterior hypothalamus.

哺乳动物中调节昼夜节律的是两个调节神经细胞群，称为视交叉上核中的下丘脑。

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For years, scientists thought that neurons in the brain's suprachiasmatic nuclei, or SCN, regulated our body clocks by firing a lot during the day and less at night.

很多年来，科学家们认为大脑的视交叉上核(scn)是生物钟中枢，具体机制是此处的神经元白天比夜间更兴奋。

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