on high alert短语⁴³³⁶⁴ 基本例句 🌏处于高级戒备状态;高度警戒;高度戒备 Our security team had been on high alert for weeks due to numerous intelligence reports that the United States would be hit with several terrorist attacks. 几周来,我们的安全小组一直高度戒备,因为无数情报报告称,几起恐怖袭击将在美国发生。 yeeyan