Платон Щукин (Редактор отдела «Экономика»)
// i表示当前要插入的元素索引（从第2个元素开始），这一点在同城约会中也有详细论述
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What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it: