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:
for you, you can turn them off with
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除了依托抖音的流量灌溉，字节跳动也在持续借助AI技术，为传统业务赋能。
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Grammarly shows an accuracy score while Ginger lacks an accuracy score feature.