直接计算，我们需要先把曲线参数化。

Well, to do it directly you would have to parameterize this curve.

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曲线重新参数化的关键是重新参数化方法。

The key problem of re-parameterization of curves is the re-parameterization method.

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曲线重新参数化的关键是重新参数化方法。

The key problem of re-parameterization of curves is the re-parameterization method.

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