单词 | parabola |
释义 | pa·rab·o·la (pə-rabə-lə) n. A plane curve formed by the intersection of a right circular cone and a plane parallel to an element of the cone or by the locus of points equidistant from a fixed line and a fixed point not on the line. [New Latin, fromGreekparabole, comparison, application, parabola (from the relationship between the line joining the vertices of a conic and the line through its focus and parallel to its directrix), fromparaballein, to compare; see PARABLE.] parabolaAny point on a parabola is the same distance from the directrix as it is from the focus (F). AC equals CF and BD equals DF. |
随便看 |
英语词典包含135693条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。