名词
中文翻译：无限制潜艇战
同义词：
['unrestricted naval warfare', 'unrestricted naval operations']
例句：
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1. The new submarines are designed to carry out unrestricted submarine warfare.
新型潜艇设计用于执行无限制潜艇作战。
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2. In the past, submarines were often used for unrestricted submarine warfare.
过去，潜艇常被用于无限制潜艇作战。
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3. The submarine fleet has been deployed for unrestricted submarine warfare against the enemy.
潜艇舰队已被部署用于对敌方进行无限制潜艇作战。