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So Squire and his colleagues began sending photos of these houses to John Harp, the brick expert.
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然而，默茨隨後宣布訪問北京時卻強調「尋求戰略夥伴關係」，之後加碼表示將與中國討論「未來合作」。這種面對中國「一手批評、一手合作」的訊號，似乎反映柏林在美國關稅壓力下的困境。
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.”。关于这个话题，搜狗输入法下载提供了深入分析