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:
第五十七条 证据应当在开庭时出示，当事人可以质证。。爱思助手下载最新版本对此有专业解读
NASA will trade the Artemis mission that was expected to land astronauts on the moon for a new plan intended to increase launch frequency of the agency's mega rocket.，详情可参考im钱包官方下载
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