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n.警戒；机敏
1、pertness───n.没有礼貌；傲慢
2、apertness───开口度
3、alertest───警觉的
4、malapertness───性病
5、overtness───显性
6、adeptness───n.熟练
7、apartness───n.冷漠；孤独
8、inertness───n.惰性；无生命力；不活泼
9、fleetness───n.快速；无常
1、Moss said improvements in student alertness made up for that lost instruction time.───莫斯说学生在课堂上机敏程度的改善弥补了损失的教学时间。
2、Decades of studies of bird flocks led researchers to predict extra alertness in the more vulnerable, end of the row sleepers.───对鸟群几十年的研究，研究人员预测，那些更容易受伤的、睡眠时处于队列末端的鸟会格外警觉。
3、Alcohol causes a loss of judgment and alertness.───酒精会使人丧失判断力和警觉性。
4、Don't bring the baby to the bed of a parent who's overtired or using medications or other substances that could impair their alertness.───不要将婴儿与过度疲劳的人同睡一张床，或者是在服药期间或其他会降低警惕性物质的大人。
5、His modesty and simplicity, as well as his alertness against the enemy are well brought out.───他的谦逊、朴实，以及对敌人的警惕性都刻划得很好。
6、Another flaw of the tiredness theory is that yawning does not raise alertness or physiological activity, as the theory would predict.───疲劳理论的另一个缺陷是，打哈欠并不能像该理论所预测的那样，提高警觉性或生理活跃度。
7、Ginkgo has been used to relieve tension and anxiety and improve mental alertness, elevate mood and restore energy.───银杏已应用于舒缓紧张和精神过敏，提高情绪，恢复体力。
8、"Oh yes, certainly, " said the girl with a sort of demure alertness which was somewhat amusing.───“呵，好，当然，”那女孩说，她表现的那种认真的，灵敏的样子，看来有点好笑。
9、She said music was more effective than silence, conversation or talk radio in achieving an optimal state of alertness.───她认为在保持最佳警觉方面，音乐比沉默、交谈、无线电通话更有效。
1、The drug improved mental alertness.
2、Daytime carryover effects, such as sleepiness and reduced alertness, are also more pronounced in the medicated elderly.
3、Full of alertness, it is not easy to stay.
4、Increases alertness, stamina, motor learning, and motor performance.
5、And alertness that goes untested for too long decays into complacency.
6、But many find they help to maintain alertness and reduce headaches and eye strain from close work.
7、A dog's protective instincts are manifested in increased alertness.
8、Caffeine can improve alertness and concentration in moderate doses.
9、Participants rated their levels of anxiety, alertness and headache.