名词
中文翻译：哨兵
同义词：
['lookout', 'sentinel', 'sentinel', 'sentinel', 'sentinel']
例句：
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1. The sentinel stood guard at the gate of the castle.
哨兵站在城堡的门口守卫。
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2. The sentinel kept watch over the sleeping soldiers.
哨兵在沉睡的士兵身边守护。
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3.The sentinel was responsible for monitoring the perimeter of the forest.
哨兵负责监视森林的边界。