名词
中文翻译：Unknown
同义词：
['warner', 'warden', 'vigilant', 'cautious', 'prudent']
例句：
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1. The teacher cautioned us to be careful on the playground.
老师警告我们在操场上要小心。
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2. He was a cautious man who always paid attention to his surroundings.
他是一个谨慎的人，总是注意他的周围环境。
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3. She is a prudent woman who always thinks twice before making decisions.
她是一个谨慎的女人，总是在做出决定之前先思考两次。