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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.，更多细节参见WPS官方版本下载
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Ami Clarke, 28, from Leighton Buzzard, Bedfordshire, started experiencing endometriosis symptoms aged 13 but was not diagnosed until a decade later.，详情可参考一键获取谷歌浏览器下载