| 单词 | Focus |
| 释义 | FocusA point related to the construction and properties of Conic Sections. See also Ellipse, Ellipsoid, Hyperbola, Hyperboloid, Parabola, Paraboloid,Reflection Property
Coxeter, H. S. M. and Greitzer, S. L. Geometry Revisited. Washington, DC: Math. Assoc. Amer., pp. 141-144, 1967. |
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