Leonardo da Vinci is usually credited with conducting the first systematic study of friction in the late 15th century, a subfield now known as tribology that deals with the dynamics of interacting surfaces in relative motion. Da Vinci's notebooks depict how he pulled rows of blocks using weights and pulleys, an approach that is still used in frictional studies today, as well as examining the friction produced in screw threads, wheels, and axles. The authors of this latest paper used an experimental setup similar to da Vinci's.
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对于不关注足球的朋友来讲，其实很难理解一支中甲球队主场的入驻对一个区域的利好。只有真正关注足球的人，才懂得。足球，是世界上关注度最高的运动，欧洲的很多城市因足球而享誉世界。例如：米兰以其时尚而闻名，但许多人也因为国际米兰和AC米兰这两支著名足球队而认识这座伟大的城市；很多人去马德里，就是为了在那里看一场皇家马德里足球俱乐部的比赛；既然都到了西班牙了，那就从马德利飞一趟巴塞罗那……中国的足球，虽然距离世界杯还很远，但很多城市依然有着超白金球市。