但当时，能做这些线材的传统工厂，靠线下渠道就能稳稳发财，没把网店当回事，随便挂了一个页面上去就了事。
Even a single night of road traffic noise, at levels that are typical of those living in a city, causes stress to the heart and blood vessels
，推荐阅读爱思助手下载最新版本获取更多信息
Collins shakes her head at the memory of the disaster, and of the friends whose lives were lost.
Complete digital access to quality FT journalism with expert analysis from industry leaders. Pay a year upfront and save 20%.
"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.