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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也正因为此，万豪在华签约速度，由2024年的“平均每周签署超3个项目”，变成了2025年的“平均不到两天新签一个项目”。。服务器推荐对此有专业解读