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People usually draw the curtains once it gets dark.

天一黑，人们通常就会拉上窗帘。

《柯林斯英汉双解大词典》

It is known as the music room because once it was used for music lessons.

它被称为音乐室，因为它曾用来上音乐课。

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But once it was built, family members of the dead, Vietnam veterans, and the general public accepted its beauty and strong emotion.

VOA: special.2009.05.06

If you make Jell-o and you make it right, then once it's set or gelled, it has mechanical properties.

如果你用正确方法做出了吉露果冻,它一旦凉下来定了型,就有了机械性能

耶鲁公开课 - 生物医学工程探索课程节选

And once you know how it sounds, making those sounds for yourself would be a lot easier to do.

一旦你知道该怎么发音，你就能更加容易地把它说出来。

想征服英语的话 - SpeakingMax英语口语达人

Surveillance technology, once it is installed for public safety purposes, quickly infiltrates other parts of our lives.

FORBES: Spotting Evil

For once it seems like the administration and the internet activists are on the same page.

FORBES: Why An Internet Blackout For SOPA And Not CISPA?

Once it was part of the Mid-Wilshire District and home to the city's movers and shakers.

NPR: $150 Million Reboot For Hollywood Temple To Stars