以下为句子列表：
英文: Rational refers to the underlying mathematical representation. This property allows NURBS to represent exact conics (such as parabolic curves, circles, and ellipses) in addition to free-form curves.
中文: 非均匀指曲线的参数化法。非均匀曲线允许（其它东西之一(我也没看懂)）多重结点的存在，这是模拟贝赛曲线所必需的。
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