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.”
Фото: Evelyn Hockstein / Reuters。关于这个话题，同城约会提供了深入分析
Less Than (2): Everything in this space must be less than 2. The answer is 0-0, placed vertically.，更多细节参见safew官方下载
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