United States Navy:
The United States Navy (USN) is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States.
en.wikipedia.org
美國海軍:
美國海軍（United States Navy，縮寫：USN或U.S. Navy），是美利坚合众国軍隊的一个軍種，負責管理所有与海軍有关的事务。
zh.wikipedia.org
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United States Navy美國海軍