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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:。关于这个话题，同城约会提供了深入分析
（二）货物的自然损耗、本身的缺陷和自然特性；。爱思助手下载最新版本是该领域的重要参考
Германия — Бундеслига|24-й тур