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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.”
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（四）收购国家禁止收购的其他物品的。
。业内人士推荐51吃瓜作为进阶阅读
华纳兄弟与派拉蒙签署协议，同意被其收购。关于这个话题，Line官方版本下载提供了深入分析
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