nappeWiktionary 原文英/nap/美词源链法语Frenchnappe↓ 派生英语Englishnappe词源说明From French nappe. Doublet of map, mop, and nape.释义名词noun1The profile of a body of water flowing over an obstruction in a vertical drop.2(mathematics) Either of the two parts of a double cone.3(geology