Two alert scientists spotted the mistake.
两个警觉的科学家发现了这个错误。
Suddenly he found himself awake and fully alert.
突然他发觉自己醒了过来，而且高度警觉。
The attack was unsuccessful and served only to alert the enemy.
进攻未奏效，反而使敌人警觉起来。
The cat is alert to every sound and movement.
那只猫对任何响动都很警觉。
They were up and alert and ready, evidently, whoever they were!
显然，不管他们是谁，他们都抖擞精神，警觉起来，做好了准备！
We become more energetic, more alert, better able to take effective action.
我们变得更有活力、更警觉、更有能力采取有效的行动。
He remembered afterward how intensely wide awake and alert he had thought he was.
后来他回想起来，还以为自己当时是多么清醒和警觉。
"Sharp" meant genuinely discerning, alert, acute rather than quick-witted or clever.
“Sharp”的意思是真正具有辨识力、警觉、敏锐，而不是机敏或聪明。
Half of your brain stays alert and prepared for danger when you sleep in a new place, a study has revealed.
一项研究表明，当你在一个陌生的地方睡觉时，你的半边大脑会保持警觉并做好准备防范危险。
At the same time, workers were required to discard old habits, for industrialism demanded a worker who was alert, dependable, and self-disciplined.
与此同时，工厂还要求工人们摒弃原来的习惯，因为工业制度需要机敏、可靠和自律的工人。
Stay alert to serious symptoms, such as chest pain or pressure, severe shortness of breath or dizziness, or faintness, and seek medical attention immediately.
要对胸痛、胸闷、严重呼吸急促、头晕、晕厥等严重的症状保持警惕，并立即就医。
Birds that are literally half asleep—with one brain hemisphere alert and the other sleeping—control which side of the brain remains awake, according to a new study of sleeping ducks.
根据一项关于睡觉的鸭子的新研究来看，半睡半醒的鸟儿——大脑的一个半球处于警觉状态，另一个半球处于睡眠状态——控制着大脑的哪一边保持清醒。
These approving contemporary critics were particularly alert to each writer's contribution to the depiction of American social life, especially to regional differences in manners and character types.
这些持肯定态度的当代批评家尤其注意到每个作家对美国社会生活描写的贡献，特别是风俗习惯和性格类型的地域差异。
The baby is very mentally alert.
这孩子脑子很机灵。
With the right amount of sleep you should wake up fresh and alert five minutes before the alarm rings.
有了适量的睡眠，你就应该在闹钟响前的五分钟精神抖擞地醒来。
As a new YouGov poll shows, Britons are surprisingly alert to class—both their own and that of others.
舆观调查网（YouGov）的一项最新民意调查显示，英国人对阶级的敏感程度令人惊讶——无论是对自己的还是别人的。
They were constantly on the alert not to be taken by surprise.
他们一直处于常备不懈状态以防突然袭击。
驾驶时保持警觉。
The world is alert and on guard as never before.
世界从没有向现在这样保持警惕和戒备。
I must alert him to the need to solve the problem.
我必须使他认识到解决这问题的必要性。
White is secure, orange is alert, red is danger.
白色代表安全，橙色代表警示，红色代表危险。
Mr Stevens is still vigorous and mentally alert.
史蒂文斯法官至今仍然精力充沛、思维敏锐。
In other words, are you being alert to their needs?
换句话说，你是否机敏地察觉到他们的需求？
Her eyes snap open, alert in a way I've not seen in months.
母亲睁开了双眼，这是几个月来我初次见她霍地警醒。
In an effort to stay alert, she drank several cups of coffee.
在努力保持警醒的过程中，她喝了几杯咖啡。
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