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High-speed imaging reveals that the squeak of soft–rigid frictional interfaces, like sneakers sliding on a basketball court, arises from intersonic opening slip pulses—analogous to earthquake ruptures—that thin ridges on the rubber confine to repeat at a musical frequency.。业内人士推荐91视频作为进阶阅读
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Spending on GP services will increase by nearly £500 million - a 3.6% boost in cash terms - to help pay for the commitment, which the government said will be used to help recruit more doctors.