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:
戴尔科技单季营收利润创历史新高，宣布现金股息上调20%
，详情可参考heLLoword翻译官方下载
最后，通过开源走向全球，如今，其海外收入已经超越国内市场。，详情可参考旺商聊官方下载
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