名词
中文翻译：哨兵船
同义词：
['sentinel ship', 'sentinel vessel']
例句：
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1. The warship was a symbol of national pride and strength.
这艘军舰是国家自豪和力量的象征。
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2. The submarine was used to monitor the enemy's movements.
这艘潜艇被用来监视敌人的行动。
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3. The frigate patrolled the waters around the island.
驱逐舰在岛屿周围的水域巡逻。