After years of studying caffeine he sees no evidence that it improves mental alertness.

经过多年的研究，他认为没有证据能证明咖啡因能提高大脑的灵敏度。

Alcohol causes a loss of judgment and alertness.

酒精使人失去判断力和警觉性。

Anesthesia alertness can play out in different ways.

术中清醒可能有几种情况。

Tail held high and stiff indicates alertness and the desire to display dominance.

尾巴抬的高高直直的，表示警惕和渴望展示强势。

And one exhibited signs of chronic sleep deprivation in regular alertness tests.

还有一位在定期的警觉性测试中表现出长期睡眠不足的迹象。

Studies show that even mild dehydration decreases alertness, increases fatigue, and negatively affects mental concentration.

研究显示，即便是轻微的脱水症状都能降低注意力甚至增加疲劳感，让专注力下降。

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

小睡一会儿可以提高警觉性，提高工作效率，午间小憩对工作而言很重要。

Based on the slider info, the participants were all jolted into alertness by Mozart's strings, regardless of age.

根据滑块显示的信息，无论年龄大小，所有参与者都被莫扎特的乐曲所震醒。

She seemed to radiate energy, alertness, confidence.

她似乎散发出活力、警觉和自信。

There would be an alertness test-an endurance test; character would score high. The world pilot would cast the deciding vote.

到时会有警觉性测试，耐力测试；品质需得到高分。世界飞行员将投下决定性的一票。