“阿英”和“客边”，就像阿爸身边两个偶尔经过的人。
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:
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A man accused of entering a mosque in Manchester with an axe, a hammer and a knife also allegedly took in zip ties and a balaclava, a court has heard.
个体生产力的二次定义与竞争力位移