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:
那天下午，我在房间打游戏，听见她在隔壁一直打电话，语气焦急，还反复辩解着什么。我走过去询问，她捂住话筒，小声告诉我，是“抖音客服”，说她误点了一个保险链接，如果不按要求操作，每月会自动扣费几百元。我心头一沉，接过电话，直接质问对方身份。对方支吾了几句后，迅速挂断了电话。
。谷歌浏览器【最新下载地址】对此有专业解读
If those don’t render for you for whatever reason, UPPER_HALF_BLOCK is a square that takes up the full width and upper half of a character, and FULL_BLOCK is a rectangle that takes up the full width and height of a character.，更多细节参见WPS下载最新地址
这是a16z在2月最新报告里揭示的一个反差。。爱思助手下载最新版本对此有专业解读