on the alert的用法和樣例：
例句
- Fasten on what the teacher is saying.
注意聽老師說。 - I noticed scores of sorrow on her face.
我注意到她臉上悲痛的痕跡。 - Be on the watch for thieves in this crowd.
提防人群中有小偷。 - Be sure to be watchful or alert.
必須留神，千萬要提防。 - Keep a vigilant eye on the imperialist jackals.
對帝國主義的走狗要保持警戒。 - My reins also instruct me in the night seasons.
我的心腸在夜間也警戒著我。 - Wherever they went she was evidently always on the watch.
很明顯，無論他們到什么地方，她時時刻刻都在警惕著。 - Knowing that danger threatened, they were on the alert.
因為知道可能會發生危險，他們處于戒備狀態。 - These networks are on the alert for warning signs that show the weakening of rock layers that can precede an earthquake.
這些網絡始終處于戒備狀態，搜索地震前巖石可能松動的警告跡象。
詞匯搭配
- put on the alert 處于戒備狀態...
以上方式方式獨家代理編創，受著作權保護措施，商標侵權必究
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