"They now seem to be on high alert, fully engaged and thinking creatively about what they can do and what is next," he said.
他说：“他们现在似乎要保持高度警惕，充分参与并创造性地思考自己能做些什么，未来会怎样。”
Experts still disagree over whether the vaccine caused cases to increase that year, and the C.D.C. will be on high alert for reports of it this year.
专家对这年增加的病例一直有不同看法和疾病控制中心对这年的报告保持警惕。
Human and animal health services must be on high alert, sharing information and quickly reporting any signs of disease in birds or humans that could be due to H5N1 avian influenza.
人类和动物卫生服务机构必须保持高度警惕，分享信息并迅速报告任何可能因H5N1型禽流感导致的禽类或人类中的疾病迹象。
Now that many hospitals and general practitioners are adopting web based applications and electronic health records, security experts have to be on high alert to take appropriate actions if needed.
目前大多数医院及医生都在采用这种基于网页的电子健康档案，安全专家们则在严阵以待，以保证随时采取恰当干预。
We have informed the airport to be on alert as the ash is quite high this time.
克里斯蒂安托说：“我们已经通知机场时刻警惕，因为火山灰现在已经上升到高空。
Whenever a film shows a close-up of a big animal like a bear, Palmer says, the viewer should be on alert: Chances are high that the animal came from a game farm or has been trained.
如果看到大型动物特写镜头的影片，比如熊，那么观众该注意了，很可能这些动物是饲养园里的或者曾受过训练。
Instead, the site says, "high-latitude sky-watchers should be alert for auroras when the cloud arrives, probably on August 10."
倒是据SpaceWeather.com网站说，“高纬度的地区的天空观测者们在云层出现是要注意了，看是否会有极光，可能是在8月10号。”
Instead, the site says, "high-latitude sky-watchers should be alert for auroras when the cloud arrives, probably on August 10."
倒是据SpaceWeather.com网站说，“高纬度的地区的天空观测者们在云层出现是要注意了，看是否会有极光，可能是在8月10号。”
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