（四）违反有关法律法规规定，升放携带明火的升空物体，有发生火灾事故危险，不听劝阻的；
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问题是，当 AI 接手这些基础执行工作，短期内利润率确实好看，但代价是新人少了练手的机会，等到五到十年后，市场极度缺乏能够审查 AI 复杂输出、承担最终决策责任的高级人才时，这个代价就会以一种所有人都措手不及的方式显现出来。
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: