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:
这是因为当时多家医院在孕产妇的登记入院上存在漏洞。对于前来生产的产妇，医院并不需要她们持本人身份证去办理住院登记。代孕中介会用客户的身份证办理住院手续，产妇则以客户的身份住院。生产后办理证明时，孩子自然成了客户的。而真正生育孩子的孕妈，其真实身份和信息都被隐去。
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经济增长既需要生产要素的积累，也要依托全要素生产率持续提高。提升全要素生产率，关键在于促进各类先进要素向发展新质生产力集聚。
"The Nielsen ratings for he speech are in, and Trump's talk-a-thon saw an 11 percent decrease from last year. Donald Trump is really dragging down broadcast television. I mean, if I were CBS I'd cancel him," says Stephen Colbert in the Late Show clip above, winking directly at the camera.
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