Just for once he arrived on time.

只有这一次他按时到了。

《牛津词典》

Record, just for once touched.

记录，只是为了曾经的感动。

youdao

Just for once, Sir!

就办这一次好啦，先生！

youdao

The Okefenokee,which is already nearly choked with plants, would probably fill in,dry up, and become just another cypress and pine forest were it not for range fires that come along every once in awhile and burn out decayed vegetation.

VOA: standard.2010.03.29

That's why your operating systems and your personal computers often crash for no apparent reason. Just because two things happen to, once in a while, occur at the same time.

这就是为什么你的电脑或者操作系统,经常会毫无预兆的崩溃了,这是因为两件事情正好同时发生了，通常还有人工输入。

麻省理工公开课 - 计算机科学及编程导论课程节选

Let's just suppose that that game's just been played once for now.

假设我们正在进行这个博弈

耶鲁公开课 - 博弈论课程节选

The former Liverpool, Real Madrid and Newcastle striker, who last played for England in March 2008, has started just once for Manchester United this season.

BBC: Capello recalls Crouch and Lennon

"I ask Bashar al-Assad for once, just once, to behave as a human being, " he said.

CNN: U.S. to provide food, medicine to rebel Syrian fighters

That is a fortune for most people, but just pocket change for the once-high-living royal, with four wives and 35 natural and adopted children to support.

CNN: Editorial: Royal Flushed