图②：在山西临汾市襄汾县西贾乡三盛村，果农对苹果园进行疏花作业。
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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But doing a perfect job of rendering complex SVG doesn’t do us much good if it slows GTK applications down too much. Recently, we’ve started to look at the performance implications of SVG rendering.
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