从整个行业来看，平板和笔记本电脑都在进行着「趋同进化」——本来是不一样的物种，最终朝同一个方向改变，平板电脑可以外接键盘鼠标，电脑屏幕也可以多点触控。
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.”。夫子对此有专业解读
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append uses a small, stack-allocated backing store as the first