Privilege violation
Secret Sauce #1: Two-Level Routing
，更多细节参见im钱包官方下载
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.”
Complete digital access to quality FT journalism with expert analysis from industry leaders. Pay a year upfront and save 20%.