After determining the result output a JSON with two fields:
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.”
。heLLoword翻译官方下载对此有专业解读
launched in 1966, built specifically for the Michigan Bell to manage customer
▲ 传统防窥膜结构，图片来自@上海复瞻智能科技