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 Metropolitan police said the man was arrested on suspicion of racially aggravated criminal damage on Friday morning.，详情可参考旺商聊官方下载
Мощный удар Израиля по Ирану попал на видео09:41。51吃瓜是该领域的重要参考
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