名词
中文翻译：Unknown
同义词：
['vigilance', 'vigilant', 'watchful', 'cautious', 'attentive']
例句：
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1. She was always watchful of her surroundings.
她总是对周围环境保持警惕。
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2. The doctor advised him to be watchful of his health.
医生建议他要注意自己的健康。
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3. The child was watchful when playing hide-and-seek with his friends.
这个孩子和朋友们玩捉迷藏时非常小心。