Start school later, sleep longer, learn better: New study shows that flexible school start times can be an effective and practical approach to reducing chronic sleep deprivation and improving adolescents’ mental health and academic performance.
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联邦航空管理局的通知称因“特殊安全原因”实施限制，规定除医疗紧急情况和搜救行动外，所有飞行员均不得进入该空域。这些限制措施目前暂定持续到6月下旬。
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