（四）对证人及其近亲属进行威胁、侮辱、殴打或者打击报复的；
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，这一点在同城约会中也有详细论述
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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.