He remembered Charlie once sang at a party.

他记得查理曾经在一次聚会上唱歌。

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She once sang backup for Madonna.

她曾经为麦当娜伴唱。

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Then they believed his promises and all at once sang his praises.

他们才相信了他的诺言，高声歌颂了对他的颂赞。

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It's not unusual, as someone once sang, for Local Health Boards to predict they'll be in the red come the end of the financial year.

BBC: In the red, in the firing line

Lastly, and perhaps most notably, I once sang the national anthem at a World Series baseball game, though I was not in the vicinity of the microphone at the time.

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Because Hadfield's vocals and guitar were recorded on the space station (and mixed with supporting tracks by Emm Gryner, a Canadian musician who once sang backup for Bowie), some observers are calling it the first music video made in space.

CNN: Astronaut sings Bowie's 'Space Oddity' in zero gravity