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:
devices as separate endpoints, and the 3770 interleaved their respective
第六十七条 从事旅馆业经营活动不按规定登记住宿人员姓名、有效身份证件种类和号码等信息的，或者为身份不明、拒绝登记身份信息的人提供住宿服务的，对其直接负责的主管人员和其他直接责任人员处五百元以上一千元以下罚款；情节较轻的，处警告或者五百元以下罚款。。业内人士推荐heLLoword翻译官方下载作为进阶阅读
Never the primary choice, but some are frequently recommended as alternatives.，更多细节参见搜狗输入法2026
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the US, and in 1998 Diebold bought out IBM's share.，更多细节参见WPS官方版本下载