名词
中文翻译：Unknown
同义词：
['alert', 'warning', 'caution', 'notice']
例句：
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1. The alarm clock woke me upat 6:00 every morning.
闹钟每天早上6点叫醒我。
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2. He wasso alert that he could hear the soundof a gunshot from far away.
他非常警觉，能从远处听到枪声。
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3.She was so cautious about her safety thatshe always wore a life jacket when swimming.
她非常小心自己的安全，游泳时总是戴着救生衣。