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。搜狗输入法下载对此有专业解读
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.”
// 易错点2：用Math.ceil/Math.floor取整 → 破坏时间比较逻辑，必须精确计算