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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:。关于这个话题，WPS下载最新地址提供了深入分析
This is the best all-terrain scooter, with reliable suspension, dual disc brakes, and thick 10.5-inch tubeless tires.，更多细节参见heLLoword翻译官方下载
"It was just incredible."