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  1. U-boat

    英式

    • n.
      a German submarine used in the First or Second World War.
    • noun: U-boat, plural noun: U-boats

    • 更多解釋
    • IPA[ˈyo͞o ˌbōt]

    美式

    • n.
      a German submarine used in World War I or World War II.

    Oxford American Dictionary