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.
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记者看到，在龙妈妈跟骗子的聊天记录中，除了经常性的威胁，不时还辅以“热心”的关怀。而在龙先生跟母亲的聊天记录中，他数次提醒母亲小心，不要被骗。“直到10月18日我妈妈才发现上当被骗并报警，两天后才告诉了我实情。”龙先生对记者说。