p>美国海军(英语:united states navy,缩写:usn或u.s.
美 国 united states of america 授课人:卜昕阳
file:seal of the united states department of the navy.svg
知识军事武器美国海军军事交通工具车辆船舶船unitedstatesnavy
centcom – emblem of the united states central command.
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