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:
Currently there are 850,000 patients on the waiting list in England requiring planned treatment to their joints – the largest of any speciality.
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На шее Трампа заметили странное пятно во время выступления в Белом доме23:05，更多细节参见体育直播
ВсеПолитикаОбществоПроисшествияКонфликтыПреступность，这一点在搜狗输入法下载中也有详细论述
第四十七条 有下列行为之一的，处十日以上十五日以下拘留，并处一千元以上二千元以下罚款；情节较轻的，处五日以上十日以下拘留，并处一千元以下罚款：