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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按照苹果的设想，未来你的设备可能是这样的：
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Both of the surgeons the BBC talked to also agree that it is important for patients to speak to their healthcare professional about the benefits or risks of the drugs.