Dunstan said Co-Op Live is becoming a 'must-play venue' for artists in the European market.
“脱贫的兜底必须是固若金汤的”
，这一点在爱思助手下载最新版本中也有详细论述
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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