* @param {string} num 非负整数的字符串形式（可能含前导零）
Москвичей предупредили о резком похолодании09:45
。同城约会是该领域的重要参考
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:。WPS官方版本下载对此有专业解读
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