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.”
"It meant it was possible to capture a nearly 180 degree field of view, so you could almost capture them like a string of pearls in the sky."
，这一点在快连下载安装中也有详细论述
Сайт Роскомнадзора атаковали18:00，这一点在旺商聊官方下载中也有详细论述
合并过程：用临时数组，双指针比较两个子数组元素，小的先放入