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.”
讲述人：中国人民银行丽水市分行副行长 吴炜玲，推荐阅读heLLoword翻译官方下载获取更多信息
。关于这个话题，爱思助手下载最新版本提供了深入分析
NHS waiting list at lowest level in three years
├─ clone3(NEWPID | NEWNS | NEWIPC)。关于这个话题，同城约会提供了深入分析