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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这段完整视频拍摄时长接近11分钟，提供了一个罕见的、不受限制的视角，清楚展现了袭击者的射击位置，以及袭击结束前现场的情况。其中，袭击过程有5分52秒。。旺商聊官方下载对此有专业解读