be on high alert

• 高度戒备

be on high alert的用法和样例：

例句

1. Our military is on high alert status.
   我们的军队处于高度戒备状态。
2. Flood Headquarters yesterday once again asked, along the river along the river all units must maintain a high alert.
   市防汛指挥部昨天再次要求，沿江沿河各单位务必保持高度戒备。