名词短语
中文翻译：正在形成的舰队
同义词：
['in the process of forming a fleet', 'in the making of a fleet', 'in the development of a fleet']
例句：
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1. The country's military has been actively developing its fleet in recent years.
该国近年来一直在积极发展其舰队。
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2. The construction of a new aircraft carrier is currently in the fleet in being.
新航空母舰的建造目前正处于形成过程中。
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3. The nation's navy is in the fleet in being, with plans to expand its capabilities in the coming years.
该国海军正处于形成过程中，计划在未来几年扩大其能力。