If you say that something is reportedly true, you mean that someone has said that it is true, but you have no direct evidence of it.
双语例句
例： More than two hundred people have reportedly been killed in the past week's fighting.
据报道有两百多人在上周的战斗中丧生。
例： Now Moscow has reportedly agreed that the sale can go ahead.
据说现在莫斯科已经同意继续销售。
例： General Breymann had been shot dead, reportedly by one of his own men.
布雷曼将军遇刺身亡，据说凶手是他的一个手下。