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:
新征程上，国资央企要着眼大局全局，坚决履行维护国家安全责任，积极服务国家区域协调发展战略和区域重大战略等，增强战略支撑能力；着力提升价值创造能力，扩大有效投资，提升发展质效；积极做好民生服务和基础保障，不断增强人民群众的获得感、幸福感、安全感。
。业内人士推荐同城约会作为进阶阅读
"Ministers must urgently get a grip on the spiralling costs of the Covid Inquiry and commit to delivering answers swiftly and efficiently."
14:09: Shreeyam - the youngest victim of the shootings that day - is seen peacefully walking away from the front line, where other protesters are pelting police with stones. Still carrying his school bag, he claps his hands - a gesture that appears calm.
第二百七十三条 不属于实际全损和推定全损的损失，为部分损失。