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:
The women’s gold medal had been a prime opportunity for Trump to live up to his stated commitment to “protect opportunities for women and girls to compete in safe and fair sports”, a claim made last February when he sought to position himself as the figure saving women’s sports. Instead, he decided to make a joke at the expense of Olympic champions.
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▲提示词：生成马斯克的九宫格大头贴照片，背景是在拍大头贴的房间内，一只手拿着这张九宫格照片，每个宫格都是不同的动作和表情，有高兴的也有悲伤的，凸显出他的年轻活泼和搞怪爱玩，更多细节参见同城约会
endorsement, added the check's amounts to the branch's daily totals (including