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:
def save(self, item: Item) - None:
。业内人士推荐体育直播作为进阶阅读
Овечкин продлил безголевую серию в составе Вашингтона09:40
--type anaconda-iso \
，这一点在下载安装 谷歌浏览器 开启极速安全的 上网之旅。中也有详细论述
\[p(x)=\sum_{i=0}^{n}y_i l_i(x)\]，详情可参考体育直播
except Exception: