... heightened alertness 高度警惕 class alertness 阶级意识 over alertness 过度警觉 ...
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class alertness
类警觉性
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CHICAGO - Giving teens 30 extra minutes to start their school day leads to more alertness in class, better moods, less tardiness, and even healthier breakfasts, a small study found.
芝加哥——一项小型研究发现：在开始一天的功课前给青少年多出30分钟的时间可以使他们在课堂上更机敏，有更好的情绪，反应不那么迟缓，而且甚至可以享用更健康的早餐。
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"I can say that,anecdotally, virtually all the teachers noticed immediately much more alertness in class, definitely more positive mood.
VOA: special.2010.10.07
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