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(A)They also found that during sleep, the brain’s cells shrink, or become smaller.
(B)While we sleep, our brains are doing much more than getting ready for the next day.
(C)She said the results demonstrate just how important sleep is to health and fighting disease.
(D)The brain expert says our brains perform two very different jobs.

Dr. Nedergaard says these toxins end up in the liver. There, they are broken down and then removed from the body. “So our study suggests that we need to sleep because we have a macroscopic cleaning system that removes many of the toxic waste products from the brain.”

The brain’s cleaning system could only be studied with new imaging technologies. The test animal must be alive in order that this brain process may be seen as it happens. Dr. Nedergaard says the next step is to look for the process in human brains. 40.She said the results demonstrate just how important sleep is to health and fighting disease. The research may also one day lead to treatments to prevent or help fight neurological disorders.

Google翻譯：

內德加德博士說，這些毒素最終會進入肝臟。 在那裡，它們被分解，然後從身體移開。 “所以我們的研究表明我們需要睡覺，因為我們有一個宏觀的清潔系統，可以清除大腦中的許多有毒廢物。”

只能使用新的成像技術研究大腦的清潔系統。 測試動物必須活著，以便可以看到這種大腦過程。 Nedergaard博士說，下一步是在人腦中尋找這一過程。 她說，結果證明睡眠對健康和抵抗疾病具有多麼重要。 該研究還可能有一天導致預防或幫助對抗神經系統疾病的治療。

單字字義：

macroscopic 宏觀的；肉眼可見的

neurological 神經學的