"I'm just obsessed with trivia. I used to want to be a chaser on The Chase."
Alison Francis,Senior Science Journalist
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that became its undoing.，这一点在WPS下载最新地址中也有详细论述
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.”
圖像來源，BBC Chinese / Lok Lee。下载安装 谷歌浏览器 开启极速安全的 上网之旅。对此有专业解读