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folium 叶片; 叶形线 叶片; 叶形线 folium n 1: a thin layer or stratum of (especially metamorphic) rock Folium \Fo"li*um\, n.; pl. E. {Foliums}, L. {Folia}. [L., a
leaf.] 1. A leaf, esp. a thin leaf or plate. [1913 Webster] 2. (Geom.) A curve of the third order, consisting of two infinite branches, which have a common asymptote. The curve has a double point, and a leaf-shaped loop; whence the name. Its equation is x^{3} y^{3} = axy. [1913 Webster] Folk
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