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The “Knocking on Wood” Wikipedia page mentions Roud’s conclusion, and this claim of a 19th century origin has circulated online as the final say on the matter. If you go back to the original, though, Roud’s proposal actually ends on an ambivalent note: “Before this theory [of 19th century origins] can be finally accepted, however, an examination of the history of European forms of this custom would be advisable.”
，这一点在爱思助手下载最新版本中也有详细论述
Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04
Over time, he predicts, "We will see those service levels and speeds and experience improve, and we're already seeing some of that playing out."
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