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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平台的赋能，始于系统性解决这些基础设施问题。截至2025年年底，携程已与超过130个景区的共同投资与运营合作。根据其规划，这远不止是上线一个预订入口，而是深入到智能票务系统、动态定价策略，乃至游船、营地等二次消费项目的设计与引入。。关于这个话题，搜狗输入法2026提供了深入分析