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1·Alcohol causes a loss of judgment and alertness.

酒精会使人丧失判断力和警觉性。

2·The drug improved mental alertness.

这种药物提高了大脑的灵敏度。《柯林斯英汉双解大词典》

3·A short nap can promote alertness and improve performance, which are important when you are at work.

小睡一会儿可以提高机警性，提高工作表现，这在你工作时是很重要的。

4·Decades of studies of bird flocks led researchers to predict extra alertness in the more vulnerable, end of the row sleepers.

通过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。

5·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。

6·That purpose is alertness.

这个目的就是警惕。

7·They also increase alertness and energy.

它们也能提高机敏性和精力。

8·It made some evolutionary sense, that state of alertness.

那种警觉的状态会形成某种进化感。

9·Research has shown that the lavender scent increases alertness.

研究表明薰衣草香味会提高人的警惕性。

10·Do not assume that more sleep equals more energy and alertness.

但不要以为多睡就意味着精力充沛。