Data Availability: All relevant data are within the paper and its Supporting Information files.
数据可用性：所有相关数据都在文章及其支持信息文件中。
Vulnerable group; Information supporting; Information guarantee mechanism; Knowledge Gap Theory.
弱势群体；信息援助； 信息保障机制；知识沟理论。
Vulnerable group; Information supporting; Information guarantee mechanism; Knowledge Gap Theory.
弱势群体；信息援助； 信息保障机制；知识沟理论。
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