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Hints：本文三处破折号，三处连字符。
Jack
the Archives of Pediatric and Adolescent Medicine
PE classes
All work and no play makes Jack a dull boy. And a worse student. Regular exercise — whether in gym class or less formally in a local park — has been shown to improve kids' mood and short-term focusing abilities. Now a new systematic analysis of numerous studies finds that keeping kids active also boosts their academic performance. The paper is in the Archives of Pediatric and Adolescent Medicine. Previous research has suggested that exercise's educational boost might come from extra blood and oxygen in the brain, more mood-lifting hormones or an increase in growth factors that build nerve cells. This confirmation comes at a time when school budget cuts are squeezing out so-called electives, such as PE classes. But the analysis suggests that even if kids from kindergarten to high school have less time in formal classes, such as math or social studies, they can do just as well as kids who have had more time to hit the books — if they've also had time to be active. So when it comes to budgeting for physical education in schools, administrators should consider doing the math.
只工作不玩耍，聪明孩子也变傻。还有更糟糕的学生。不管是在健身房里还是休闲的公园里，常规的训练被证实是能够提高孩子的心情以及短期的集中能力。现在一项大量研究的系统分析发现让孩子活跃一点也能促进他们的学业成绩。这篇论文在儿科和青少年医学档案中。 之前的研究表明，运动在学业上的加强可能来自于其中多余供应的血和氧，以及更多的能够组建更多的神经细胞的生长激素（荷尔蒙）。 这一证实出现在学校不断的削减所谓的选修课比如体育的预算上的时候。但这项分析同时也显示，即使孩子从幼儿园到高中都花比较少的时间在正规课堂上，比如数学或者是社会学，如果他们有时间从事体育活动的话，他们依然可以和那些花大部分时间在课本上的孩子们有一样的表现。所以，当学校考虑体育预算的时候，行政人员应该考虑下数学的预算。