人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用
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.”
，这一点在搜狗输入法2026中也有详细论述
Over the years, they’ve also refined their training practices, which has ultimately led to more developers joining both projects.
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