1·The armed forces were on high alert to guard against any retaliation.
武装部队保持高度警惕，以防发生任何报复行为。
—— 《柯林斯英汉双解大词典》
2·We were on high alert.
我们都处在高度戒备状态。
3·The world needs to be on high alert.
世界需要高度警惕。
4·Both sides put their nuclear forces in high alert.
双方的核力量都在高度戒备中。
5·I think, again, it puts people on high alert all the time.
我想，那是人们又会面临高危警钟了。
6·For unusual luggage, guests or vehicles remain on high alert.
对异常的的行李、客人或车辆保持高度警惕。
7·Without stress management, all too often your body is always on high alert.
不去控制压力，身体会一直处于高警戒状态。
8·Strong sense of responsibility and service, good work attitude and high alert.
具有强烈的责任心和服务意识，对工作认真负责，有高度的警惕性。
9·We are on high alert against the challenge that you referred to in your question.
我们对你在问题中提到的挑战保持高度警惕。
10·For many of us, this means living in a constant state of high alert, or a state of fear.
对于我们许多人来说，这意味着处在一个持续高度警惕的状态，或是恐惧的状态。