对于平面曲线，当然还有些有趣的问题，比如可以研究各种机械配件。

With plane curves, certainly there's interesting things with all sorts of mechanical gadgets that we can study.

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频数曲线提供脆的食物一个机械签字。

The frequency curve provides a mechanical signature of the crisp food.

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并且这些曲线在机械加工上是可行的。

And these curves are feasible in machine work.

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