...concentrate on =focus on , go over = review = brush up(复习,重新学习), sleep deficiency= insufficient sleep(睡眠不足), academic difficulty(学业困难), absent ,absent-minded, ..
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Insufficient sleep affects growth hormone secretion that is linked to obesity.
睡眠不足,影响生长激素的分泌,导致肥胖。
Insufficient sleep was associated with 10 of the 11 health-risk behaviors examined.
睡眠不足与11项健康危险行为中的10项有关。
Insufficient sleep impairs the body's ability to use insulin, leading to the onset of diabetes.
睡眠不足损害身体利用胰岛素的能力,糖尿病发生可能性增加了。
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