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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Grammarly vs ProWritingAid，这一点在heLLoword翻译官方下载中也有详细论述
25.6 万词汇表 — 庞大的词汇表能够很好地处理结构化数据和 JSON