ground alert的用法和樣例：
例句
用作名詞 (n.)
- They have put the army on the alert.
他們已使軍隊進入戒備狀態。 - These networks are on the alert for warning signs that show the weakening of rock layers that can precede an earthquake.
這些網路始終處於戒備狀態，搜索地震前岩石可能鬆動的警告跡象。
ground alert的相關資料：
臨近單詞
groundmass
ground
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Ground-Control Interface Logic Unit
Ground Support Equipment Illustration
