形容词
中文翻译：警觉的
同义词：
['vigilant', 'wary', 'watchful']
例句：
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1.The police were alert to the dangers of driving under the influence.
警方对酒后驾驶的危险保持高度警觉。
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2.He was always alert to his surroundings when he was on duty.
他在值班时总是对周围环境保持警觉。
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3. She is alert to any potential threats that may arise.
她对可能出现的任何潜在威胁都保持警惕。