'Houston, we've had a problem'
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These color-changing sunglasses are like something out of a sci-fi movie，这一点在WPS官方版本下载中也有详细论述
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: