英语语法分析

Hyperbola from Four Points.

由四点作双曲线。

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。

A hyperbola approaches but does not meet its asymptote.

双曲线逐渐接近它的渐近线但不相交。