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:
Mackay's investigation led to Christopher Hampton being jailed for life for the teenager's murder.
，这一点在safew官方下载中也有详细论述
Раскрыты подробности похищения ребенка в Смоленске09:27
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