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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习近平总书记深刻指出,高质量发展应该不断提高劳动效率、资本效率、土地效率、资源效率、环境效率,不断提升科技进步贡献率,不断提高全要素生产率。