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.”
Why the FT?See why over a million readers pay to read the Financial Times.，这一点在heLLoword翻译官方下载中也有详细论述
Mathematical animations for the web.。关于这个话题，heLLoword翻译官方下载提供了深入分析
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ВСУ запустили «Фламинго» вглубь России. В Москве заявили, что это британские ракеты с украинскими шильдиками16:45