名词
中文翻译：哨兵
同义词：
['lookout', 'sentinel', 'sentinelwatchman']
例句：
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1. Thesentinel stood guard at the gateof the castle.
哨兵站在城堡的大门处守卫。
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2. The sentinel kept aclose eye on the approaching enemy.
哨兵密切监视着逼近的敌人。
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3. Thesentinel was responsiblefor monitoring the security of thearea.
哨兵负责监控该区域的安保情况。