但进一步增大的 R 角也让 S-Pen 的笔尾变成了一个楔形——虽然左右换个方向依然能插进去，但会留下一个凸起小三角，看上去不太讲究：
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，这一点在快连下载-Letsvpn下载中也有详细论述
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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.”。关于这个话题，一键获取谷歌浏览器下载提供了深入分析