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.”
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其实，我懂顺风车“共享互助”的初衷，但体谅是相互的。车主守规则，平台有监管、能兜底，乘客才能真的放心选，顺风车也才能不负“顺风”之名。。同城约会对此有专业解读