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:
url: https://example.com/hello
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Microsoft's AI PC beginner's guide demonstrates how convoluted its branding has become, but hey, at least 'AI is not here to replace you'
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在成本方面，当前新能源车不仅使用成本低，国家相关部门在补贴、置换等方面的力度都高于燃油车，这就使得消费者的购车成本也相对较低。