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.
图①：在陕西白水县，西北农林科技大学白水苹果试验站站长高华（右）和硕士研究生于萌正在检测苹果糖度。
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Visitors to the Victoria & Albert Museum (V&A) will be able to "step back in time" as a reconstruction of the original YouTube watchpage goes on display.
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