A praying mantis on high alert waits for insects drawn through the night to collect Ochroma blossom pollen.
一只螳螂正伏在高处，机警的等待着那些在夜空里飞来飞去以收集巴尔沙树花粉的昆虫。
Key installations in Kabul and around the country remain on high alert as a result of the assault on the hotel.
对酒店的攻击事件使喀布尔和全国各地的主要设施保持高度警戒。
Specifically, Helt said, it could diffuse stress after a period of being on high alert and spread a feeling of calm through a group.
特别是它可以在经历一段高度紧张的阶段后，分散压力，在群体里传播平静的感觉。
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。
A former American official, speaking on condition of anonymity, says that Washington is even now in a state of "high alert".
一位前美国官员，在匿名的状态下表示，华盛顿现在甚至处在“高度警戒”的状态之中。
Even in Sierra Leone, where health officials were on high alert, the virus spread undetected for at least a month, sparking numerous chains of transmission that rapidly multiplied.
塞拉利昂的卫生官员保持着高度警惕，即便如此该病毒在没有被发现的情况下至少传播了一个月，触发了多个很快成倍数增长的传播链。
Even in Sierra Leone, where health officials were on high alert, the virus spread undetected for at least a month, sparking numerous chains of transmission that rapidly multiplied.
塞拉利昂的卫生官员保持着高度警惕，即便如此该病毒在没有被发现的情况下至少传播了一个月，触发了多个很快成倍数增长的传播链。
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