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:
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your largest class size.。搜狗输入法2026是该领域的重要参考
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那么问题来了，一台能触控 MacBook，能带来什么样的价值？，这一点在谷歌浏览器【最新下载地址】中也有详细论述