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:
ME – also known as Chronic Fatigue Syndrome – has long been one of medicine’s most perplexing conditions. With no definitive diagnostic test and a legacy of scepticism in parts of the medical community, patients have often struggled to be believed. But a surge of new research may finally be shifting the landscape.，详情可参考heLLoword翻译官方下载
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By now, it's firmly established that modern humans and their Neanderthal relatives met and mated as our ancestors expanded out of Africa, resulting in a substantial amount of Neanderthal DNA scattered throughout our genome. Less widely recognized is that some of the Neanderthal genomes we've seen have pieces of modern human DNA as well.
这种“量跌价升”的背后，是不同价格段市场的分化：入门级市场萎缩，高端市场免疫，中端市场承压。。51吃瓜是该领域的重要参考