名词
中文翻译：哨兵
同义词：
['sentinel', 'sentinel', 'sentinel']
例句：
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1. The postman delivered the mail at the corner of the street.
邮差在街角投递邮件。
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2. The post office is located in the center of town.
邮局位于镇中心。
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3. He was a trusted postman who always kept his word.
他是一个值得信赖的邮递员，总是守信用。