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。关于这个话题，爱思助手下载最新版本提供了深入分析
約在同一時期，她在英國的鄰居亦收到信件，指若將她交給中國使館可獲9.5萬英鎊賞金。類似信件亦寄給至少另一名在英港人社運人士。
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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.”