Once in a moment, we thought he had grown.

曾经在某一个瞬间，我们以为自己长大了。

youdao

Once in a moment, we all thought that grew up.

曾经在某一瞬间，我们都以为长大了。

youdao

Once in a moment, we all thought that he grew up.

曾经在一瞬间，我们都以为自己长大了。

youdao

This possibility of a once in a generation moment passed us by and we will regret it.

CNN: Was Rio+20 a failure of political leadership?

Four years ago, it became a once in a lifetime moment.

CNN: How Obama made opportunity real in America

Speaking to the Independent newspaper, Richard Reeves - who stood down as the Lib Dems' director of strategy on Thursday to work in America - said Tuesday's vote was a "critical moment" for Lords reform and "a once-in-a-generation chance" to secure it.

BBC: UK Politics