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.
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We’ve tested a variety of Wi-Fi extenders to find the best options for different budgets and setups, from affordable fixes for small dead zones to higher-end models built to handle heavier traffic and faster connections.。搜狗输入法2026对此有专业解读
（作者为三峡植物园林业技术推广站站长，本报记者吴君采访整理）