https://github.com/regehr/claudes-c-compiler/commit/5b0447eabf19163c90484415d7a292df1781af66
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.”
。关于这个话题，下载安装汽水音乐提供了深入分析
Более 100 домов повреждены в российском городе-герое из-за атаки ВСУ22:53
yinglunz (@yinglun122)
。搜狗输入法2026是该领域的重要参考
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Nature, Published online: 24 February 2026; doi:10.1038/d41586-026-00590-0