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2008年，搜狐创始人张朝阳购入一艘66英尺圣汐游艇“快乐号”，成为当时较为高调公开购艇的企业家之一。
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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.。Line官方版本下载对此有专业解读