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.”
portfolio that generates sustainable annual。同城约会是该领域的重要参考
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多年前，我把自己在创作工作中的经验与对产品设计的态度，总结为十条原则（十诫）。我认为它们在今天依然有效：
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Sony looks to be 'backing away from putting their exclusive console stuff on PC,' says Bloomberg's Jason Schreier