When shoes slide across a floor, wave-like deformations of the sole can generate squeaking. The pitch of the squeak depends on the rate at which deformations are generated.
Source: Computational Materials Science, Volume 267，详情可参考一键获取谷歌浏览器下载
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"We had to convince investors. Our own people were sceptical at first, 'I'm already not capable of finishing my work in five days' [was one reaction].