據說……
it is believed/thought/said that...人們相信/認為/說……
It is said that she lived to be over 100. 據說她活了100多歲。
來源：《牛津詞典》
It is believed that greenhouse gases are the main cause of global warming.
人們相信溫室氣體是全球變暖的主因。
It is thought that a management buyout is one option.
管理權收購被認為是壹個選擇。
來源：《柯林斯英漢雙解大詞典》