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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://cn.wsj.com/articles/%E6%9C%AC%E5%91%A8%E5%85%A8%E7%90%83%E7%B6%93%E6%BF%9F%E5%A4%A7%E4%BA%8B%E9%A0%90%E5%91%8A-121548652208>