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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:，推荐阅读夫子获取更多信息
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Меган Маркл раскритиковали в сети из-за мятой одежды на встрече с беженцами。旺商聊官方下载是该领域的重要参考
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