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:
神韻藝術團週三的聲明稱，該藝術團在過去兩年於全球的演出中，已遭遇數十次威脅。
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Yungblud has always wanted to take his festival, which started in Milton Keynes, abroad，详情可参考同城约会
What is the difference between Bitcoin and Blockchain technology?Bitcoin is a cryptocurrency, which is powered by Blockchain technology while Blockchain is a distributed ledger of cryptocurrency
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