单词	parabola
释义	parabola A conic with eccentricity e = 1 . It is the locus of a point that moves so that its distance from the focus is equal to its perpendicular distance from the directrix . A chord through the focus, perpendicular to the axis, is called the latus rectum . For a parabola with its vertex at the origin, lying symmetrically about the x-axis, the equation is y2 = 4ax , where a is the distance from the vertex to the focus. The directrix is the line x = -a , and the latus rectum is 4a. See illustration. A parabola
随便看	Bose-Einstein condensation boson bosonization bound state boundary layer Bourdon gauge Boyle's law Boyle, Robert Brackett series Bragg's law Bragg, Sir William Henry brass Brattain, Walter Braun, Karl Ferdinand breakdown breaking stress breeder reactor Bremsstrahlung Brewster's law bridge rectifier Brinell hardness Britannia metal British thermal unit broken symmetry bronze

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