形容词
中文翻译：警惕的
同义词：
['alert', 'watchful', 'vigilant']
例句：
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1.The police were very vigilant in their patrols.
警察在巡逻时非常警惕。
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2. She was very vigilant about her safety.
她对自己的安全非常警觉。
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3.The vigilant guard kept a close eye on the entrance to the castle.
警觉的守卫密切监视着城堡入口。