从数据来看，尽管国内八大民营酒店集团旗下在营酒店数据并非一味悲观，但投资氛围已然受到影响，连锁酒店扩张速度在此前已显著放缓。2025年最后一个季度，连锁酒店净增门店数同比增速降至5.2%，而2024年同期则为18.6%，增速落差悬殊。
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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.