“it is said that …” 表示“据说/人们说/传闻……”，用于引出一种未经证实或不指明来源的说法，语气较为客观、含蓄（暗示说话者不对信息真实性作保证）。
/t z sd t/
It is said that this town is very quiet at night.
据说这个小镇晚上很安静。
It is said that the manuscript was hidden for decades before it was finally discovered by a researcher.
据说这份手稿被藏了几十年，直到后来才被一位研究人员发现。
该结构由被动语态 “it is said”（字面“它被说”）发展而来，用形式主语 it 来承接后面的从句（that 引导的内容），常见于新闻、传闻、历史叙述等需要保持距离或避免直接断言的语境。
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