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:
传统火电、电网运维岗位增长见顶，而分布式新能源、独立储能、高压直流、液冷散热、微网调度岗位爆发式增长。电力工程师、新能源项目经理、电网合规专家，成为AI时代最稀缺的人才。
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巴基斯坦三军新闻局局长乔杜里27日在新闻发布会上说，阿富汗方面从其境内向巴基斯坦开伯尔-普什图省的53个地点发动袭击。