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:
Mads Gade, CEO of Ineos Energy points to the huge pipes of the wellhead which, for decades, carried oil and gas up from below the seabed.，详情可参考旺商聊官方下载
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But there has been some energetic campaigning for change by high-profile figures, including Sir Chris Hoy, who has terminal prostate cancer, and Lord David Cameron, who recently revealed he'd been treated for it.
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