1·That is the contour plot of f with a hyperbola on top of it.
上面这个是f的等高线，黄色的就是双曲线。
2·Well, if you look at all these hyperbola's, xy equals constant.
如果你们看这里所有的双曲线的话，xy等于常数。
3·The instrument to draw hyperbola has great significance for teaching and engineering drawing.
绘制双曲线的仪器在教学及工程绘图方面具有实际意义。
4·Another is to intenerate the input vectors by hyperbola tangent function.
二是采用双曲线正切函数柔化输入矢量。
5·This paper describes the geometric meaning for the parametric equation of hyperbola and parabola, respectively (see examples 2 and 3).
本文将分别对双曲线、抛物线的参数方程阐述几何意义(见例2、例3)。