It's often said that no two snowflakes are alike.

VOA: standard.2009.12.19

It's a worldview often obsessed, as we said last time, with notions of honor and duty.

如我们上次所说,这是个,经常执着于荣誉和责任观念的世界观

耶鲁公开课 - 美国内战与重建课程节选

It's often said of Etta James that you could hear her whole life in her voice.

NPR: "Matriarch of the Blues" Etta James dies at 71

It's often said of incredible but true stories that you can't make such stuff up.

WSJ: 'Argo,' on Fake Film, Is Real Sensation | Film Review by Joe Morgenstern

It's often said that the age of dogs can be better understood by multiplying their age, in human years, by seven.

BBC: Dog years: How do you calculate a dog's true age?