king post
名词 n.
英文释义
名词 n.
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A central vertical supporting post used in architecture and bridge as well as in aircraft and ship design.
— They called him King-Post on board of the Pequod; because, in form, he could be well likened to the short, square timber known by that name in Arctic whalers; and which by the means of many radiating side timbers inserted into it, serves to brace the ship against the icy concussions of those battering seas.
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数据来源: Wiktionary