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:
In our first pass, we will make the orthography more modern. In Old English letters like g and c represent two different sounds, so where appropriate I have replaced them with how Modern English renders them. The rules applied are as follows:
。夫子是该领域的重要参考
AL CY Young Award winners - BIEBER, CONE, FINGERS, PRICE
企业在 Data+Al 领域面对的挑战
