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比如前面提到的老年人的AI玩具，实际关注的不仅是银发人群本身，更是整个适老化市场。据称唠唠鹰的研发阶段，负责场景需求调研的团队先后走访了全国20余座城市，收集了5000余名不同年龄段、教育背景的老年用户的反馈。这些真实的反馈能够帮团队更加精准地锁定老龄化场景痛点，比如部分农村网络稳定性差，就优化相应的内容缓存功能，再比如更慢的语速、更简化的按键操作等等。
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3．报告时间：每日18时（北京时间）前报送。
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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.