单词 | keel |
释义 | keel [kēl] NAVAL ARCHITECTURE A steel beam or timber, or a series of steel beams and plates or timbers joined together, extending along the center of the bottom of a ship from stem to stern and often projecting below the bottom, to which the frames and hull plating are attached. VERTEBRATE ZOOLOGY The median ridge on the breastbone in certain birds. Also known as carina. |
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