云耀深维打印的传动泵（图源/企业）
"Tuning frictional behavior on the fly has been a long-standing engineering dream," said co-author Katia Bertoldi of Harvard University. "This new insight into how surface geometry governs slip pulses paves the way for tunable frictional metamaterials that can transition from low-friction to high-grip states on demand.” In addition, the dynamics revealed by these results are similar to those of tectonic faults and thus give scientists a new model for the mechanics of earthquakes, according to their new paper published in the journal Nature.
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3. 从焦虑到常态，小镇青年的现实与困境显然，开电车回乡过年，确实已经成为很多小镇青年的首选，但与此同时，一些现实问题仍旧难以避免。
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