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[VOA慢速] VOA慢速精精听2019-01-31

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X said this experiment does fit in with the larger body of research on the important of sleep. In fact, the amount of sleep the people get have been decreasing greatly, he said. At 2015 study, found the number of Americans who sleep less than 6 hours a night increase by about 30 million between 1985 and 22.
XX and XX offer some way to avoid health problem cause by a lack of sleep. Amount this, they say, parent should try to get enough sleep themselves to demonstrate its important to his children.
XXX noted even some medical school program have forgot to require the student doctor to sleep more to prevent accidence.
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