The U.S.State Department has issued a fresh travel alert for India, saying the U.S.government continues to receive information that terrorist groups may be planning attacks here.

VOA: standard.2009.10.30

This is more of a spoiler alert, but you've had 41 years to see this movie.

它不只是一个扰流警报，但是你用了41年来看这个电影。

哈佛公开课 - 计算机科学课程节选

Because it's a very intense job they have to be alert every moment.

因为是高度集中的工作,他们需要时刻保持警惕。

普林斯顿公开课 - 国际座谈会课程节选

General Fonseka,in the letter, says Sri Lanka asked India on October 15 to place troops on alert in case they would be needed to intervene to foil a coup on the island.

VOA: standard.2009.11.14

Spoiler alert. And he has a standing offer, he says, "I'll pay whatever the amount is, $10,000 to the first person who can document some effect done in supernatural terms that I can't reproduce through trickery."

他给出一个长期悬赏,他说,我将不计报酬,给第一个在我面前展示,我用魔术无法再现的超自然,现象的人10000美元

耶鲁公开课 - 死亡课程节选

"I hope that what a study like this will do would be to help alert clinicians, residents in training, and medical students that severity is an important factor to consider in planning treatment,".

VOA: standard.2010.01.08

"It's physiological and it's emotional." "Physiologically,we have a tendency when we come into a situation that seems dangerous we get a lot of chemicals flowing through our bodies to help us stay alert, to be able to act if we need to act.

VOA: standard.2010.07.01

"This change to a higher phase of alert is a signal to governments, to ministries of health and other ministries, to the pharmaceutical industry and the business community that certain actions should now be undertaken with increased urgency, and at an accelerated pace,"

VOA: standard.2009.04.29