Khapung - who retired in November - has not replied to the BBC's request for comment.
What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:
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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。
Richard MorrisTechnology reporter
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