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:
Once I’m done testing, I compare each of the keyboards I’ve tested, looking at important metrics like build quality, typing experience, customizability, and repairability. While these metrics are fairly objective, there are quite a few subjective ones as well: Comfort, size, aesthetics, and layout preference will ultimately depend on the individual user, so I try to focus on a keyboard’s intended use case and general appeal instead of focusing on my personal preferences.
。关于这个话题，体育直播提供了深入分析
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