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单词 quarter-hollow
释义

quarter-hollow

noun
A concave moulding that has an arc which is (approximately) a quarter circle; (also) an engraving tool used to make convex or concave mouldings (more fully quarter-hollow tool).

Origin

Mid 19th century; earliest use found in Charles Holtzapffel (1806–1847), mechanical engineer and technical writer.

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更新时间:2024/11/12 9:15:59