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What we see is that there are in fact two entangled traditions of “knocking on things for good luck”: touching iron, and touching wood. We also find that they are widely distributed, but also have a pretty clear cluster around the Mediterranean and Europe.。safew官方下载是该领域的重要参考
"url": item.get("url"),，这一点在旺商聊官方下载中也有详细论述
2.2.3 Mermaid 类图（classDiagram）