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.”
В Финляндии предупредили об опасном шаге ЕС против России09:28
，这一点在爱思助手下载最新版本中也有详细论述
// 核心Map：key=nums2的元素值，value=该元素在nums2中的「下一个更大值」
（一）典当业工作人员承接典当的物品，不查验有关证明、不履行登记手续的，或者违反国家规定对明知是违法犯罪嫌疑人、赃物而不向公安机关报告的；