This striking action is why the piano is a percussion instrument instead of a string instrument.

这个敲击的动作就可以解释为什么钢琴是打击乐器而不是弦乐器。

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Even with math models and calculations, there will never be an "ideal string" because of the physical parameters inherent to the piano, Patin said.

甚至利用数学模型和计算工具，也将不会有“理想琴丝”，因为物理参数是钢琴固有的，巴丁说。

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For every individual piano, each string varies by length and has to achieve different tension and stiffness.

针对每个钢琴来说，每个琴丝在长度上都不同，并要获得不同的张紧力和刚度。

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