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:
“If you’re the one that is going to capture the actions from the meeting and the next steps, and you’re listening and you’re observing, that isn’t necessarily a negative,” L’Oréal‘s Stephanie Kramer explained. “You are in the room, and you are absorbing how those points are coming to be. You’re developing the skills of inference.”
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Labour backbenchers turn on Rachel Reeves as MP claims former students are stuck in a loans ‘Hotel California’，详情可参考搜狗输入法
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