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。
We studied the hyperbola function method and generalized it.
对双曲函数法进行了探讨，且对其进行了推广。
Its hyperbola ferroconcrete appearance became the typical symbol of power station.
它的双曲线钢筋混凝土外形成了发电站的典型标志。
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。
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。
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