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。

Attention is turned on. Alertness is turned on.

注意力已开启。警觉性已开启。

But, if you're scared it could happen to you, there are ways to further reduce your risk of anesthesia alertness.

不过，如果你害怕这种可能性也会发生在你身上，医生也有降低这种风险的办法。

A hint of alertness came into Mr. Carter's manner.

卡特先生的举止中透出一丝警惕。

Some subjective tests of alertness, fatigue, vigour, and also some cognitive performance tasks.

一些对警觉性、疲劳、活力以及一些认知表现任务的主观测试。

Tiger, whose eyes are bright and piercing, observes its surroundings with great alertness.

8.老虎的眼睛明亮而锐利，观察周围的事物非常机敏。

Inhaling vetiver scent improves alertness and brain function.

吸入香根草香味可以提高警觉性和大脑功能。

An athlete's best performance is achieved with particular balance of alertness and anxiety.

运动员的最佳表现是在警觉性和焦虑性达到特定平衡的情况下实现的。

Smoking is also not good for sleep because nicotine increases heart rate and alertness.

吸烟也不利于睡眠， 因为尼古丁会增加心率和警觉性。

Hawat's eyes were two pools of alertness in a dark and deeply seamed face.

哈瓦特的眼睛是一张黑色且布满皱纹的脸上的两只机警的水潭。

Currently, North Korea just raised up their military alertness.

目前, 朝鲜只是提高了他们的军事警戒。