钢琴设计师们平衡琴丝的张力和刚度，但也同时考虑了许多其他的因素。
Piano designers balance tension and stiffness of music wire, but many other factors are considered as well.
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。
For every individual piano, each string varies by length and has to achieve different tension and stiffness.
通过这些信息他们可以计算出加入石墨烯后高分子复合材料的刚度改进。
From this information they calculated the improvement in stiffness the graphene gave to the polymer composite.
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