The fox froze, wary eyes fixed upon this strange new phenomenon.

狐狸惊呆了，一双警觉的眼睛盯着这个新出现的奇怪身影。

Thomas Jefferson is often credited with saying that The price of liberty is eternal vigilance.

托马斯·杰斐逊有一句话经常为人所称赞，自由的代价是永恒的警觉。

Oh! So your brain will stay alert?

哦！所以你的大脑会处于警觉状态？

Norepinephrine has substantial effects on focus, attention, vigilance and it improves mood.

去甲肾上腺素对人的专注度、注意和警觉性都有显著影响，而且可以改善情绪。

Alcohol causes a loss of judgment and alertness.

人失去判断和警觉性。

On the occasions when hunting has been tried, local animal rights people have worked to secure court orders against the hunts. And when that is failed, they stop the hunters, banging on pots and pans to alert the deer.

他们通过狩猎减少鹿的存在，但是当地动物保护设法通过法院命令反对狩猎。当他们失败时，他们便通过敲打锅碗瓢盆鹿警觉，阻止狩猎。

But there are many chemical signals we give off—including ones that might signal alarm, aggression or other emotions.

我们散发出的化学信号有许多种，包括那些传递警觉，攻击或其他情绪的化学信号。

'What's the matter? ' she said in alarm.

“出什么事了？”她警觉地问。

Petunia was breathless, alarmed at being caught.

被逮个正着的佩尼警觉的喘着气。

" 'Professor'? " repeated Riddle. He looked wary.

“‘教授’？”里德尔重复了一句，他露出很警觉的神情。

The dynamics between rivals, buyers, suppliers, new entrants, and substitutes are what keep any healthy private sector industry on its toes.

竞争对手、买家、供应商、新竞和替代之间的动态是任何健康的私营部门行业保持警觉的原因。

So let's be vigilant, but not afraid.

所以，我们应该保持警觉，而不是充满恐惧。

The research team say they believe the alert but passive nature of television watching may be creating stress on the mind, which contributes to memory decline.

研究小组表示，他们相信看电视时的被动警觉可能会在心理上造成压，从而导致记忆下降。

Biologist Sara Angrioti says the zero sightings is alarming but not surprising.

生物学家Sara Angrioti表示，大白鲸的消失不仅让人吃惊，更要引起人们的警觉。

When dogs are alert, they stand with their tails raised and ears up.

当狗警觉时，耳朵会竖起来，尾巴也会立起来。

Boa's aren't venomous but his escape still set off alarms both actual and emotional.

蟒蛇并没有毒，但他的逃跑仍然引起了实际和情感上的警觉。

And you can be aware of these and you can be alert to these but you have to ask that question- what will people pay me to do?

你要意识到这些，对此产生警觉，同时一定要问自己——人们会付钱让我做什么？

In this way, employees would feel more rested and alert.

这样员工会感觉休息得更充分，也更加警觉。

Fish and other sea animals can hear well and many of them can make different types of warning sounds. In the future you will be hearing more and more about the sea.

鱼和其他的海洋动物有很好的觉，而且它们能产生很多不同种类的警觉声音。 在未来，你可能会到越来越多关于海洋的事情。

The San Francisco SPCA says it's important to begin teaching your dog to learn how to be OK with being alone for short stretches of time and to be alert for signs of separation anxiety.

旧金山动物协会建议现在开始教你的狗学会如何在短时间内保持独处的状态，并且对与主人分开焦虑的迹象保持警觉是很重要的。