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:
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Medics are often expected to work night shifts, weekends and longer hours, for which they receive extra payments.
“坐牢”,是我对狗寄养生涯的戏称。
When will the new appointments be announced?