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.”
Жители Санкт-Петербурга устроили «крысогон»17:52
。关于这个话题，搜狗输入法下载提供了深入分析
// TypeError: Cannot obtain lock — stream is permanently locked
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Solving this issue is hard, and the CG has been focused on extending the WebAssembly language. Now that the language has matured significantly, it’s time to take a closer look at this. We’ll go deep into the problem, before talking about how WebAssembly Components could improve things.