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:
（一）隐藏、转移、变卖、擅自使用或者损毁行政执法机关依法扣押、查封、冻结、扣留、先行登记保存的财物的；。Line官方版本下载对此有专业解读
，这一点在搜狗输入法2026中也有详细论述
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Mr Duffy called for proposals from commercial companies to build a reactor that could generate at least 100 kilowatts of power.，推荐阅读Line官方版本下载获取更多信息