单词：ground alert
ground alert的用法和样例：
例句
- They have put the army on the alert.他们已使军队进入戒备状态。
- These networks are on the alert for warning signs that show the weakening of rock layers that can precede an earthquake.这些网络始终处于戒备状态，搜索地震前岩石可能松动的警告迹象。
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