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Asymptote
Example
The hyperbola has asymptotes that represent the lines the curve approaches but never crosses.
双曲线有渐近线代表曲线逐渐接近但从不相交的直线。
A rational function may have vertical asymptotes where the function approaches infinity.
一个有理函数可能在其无限接近的地方有垂直渐近线。