「我完全負擔不起出國。我昨天查了一趟國內旅遊，每人2億里亞爾（152美元），我們一家四口光是機票就8億（609美元）。2017 年，去歐洲整趟行程也才2億。」
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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