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.”
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，这一点在safew官方下载中也有详细论述
Мерц резко сменил риторику во время встречи в Китае09:25，这一点在夫子中也有详细论述
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Москвичей предупредили о резком похолодании09:45