刘年丰：看似搬箱子是一个单调重复的工作，但其实有多个难点。
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:
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用产品经理的心态对待咖啡，不断迭代好喝的咖啡。公众号：咖啡平方。Line官方版本下载对此有专业解读
通过网上的资料，流程见下图 ：，详情可参考heLLoword翻译官方下载