一旦达到适当的提升级别，活动就完成了。

Once the appropriate promotion level is attained, this activity is completed.

youdao

贫穷国家一旦达到更替生育水平将会有何后果？

WHAT happens in poor countries when they reach replacement fertility?

youdao

我不能肯定，你一旦达到那个点，将会有非常明确的新设计的明显优势。

I'm not sure that once you reach that point there would be any clear significant advantages to the new designs.

youdao

Once you know what pieces to look for, what mental constructs to reach for, can you realize all right I want to make some dancing figures go back and forth, I need to loop this way and loop this way and check if I'm on the edge and so forth.

一旦确定需要查找的部分,想要达到那种层次，你是否意识到,我想做出一些可以来回走动跳舞的人，我需要按这种方式那种方式让它转圈,并检查我是否,到了屏幕的边缘等等。

哈佛公开课 - 计算机科学课程节选

You've got this policy tool of interest rates but once it hits zero you're out of business.

你拥有利率这一政策工具,但是一旦利率达到零点，你便失业了。

耶鲁公开课 - 金融市场课程节选