1. 据传闻;据说
    If something is rumoured to be the case, people are suggesting that it is the case, but they do not know for certain.

    e.g. Her parents are rumoured to be on the verge of splitting up...
           据说她的父母快要离婚了。
    e.g. It was rumoured that he had been interned in an asylum for a while.
           据说他曾在一家精神病院关过一段时间。