朱老板抿掉一口“查理七世”，滔滔不绝讲起他在欧洲的经历。他的口味又变了，现在他喜欢的是欧洲女孩，“有感觉”。什么感觉？连他自己也说不清。
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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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