有了初二回家这次拥挤的顺风车经验，在约返程顺风车的时候，我特意在沟通时反复确认：“车上一共载几个人？不会‘满载’吧？”在得到车主“空间绝对宽松”的保证后，我才放心下单。
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:
。夫子是该领域的重要参考
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