Once an article appears on the show, hunting it down in stores is harder than finding a needle in a haystack.

一旦一件商品成为焦点，想在商店里找到它简直比大海捞针还难。

youdao

Once they have done that they post it on social media.

一旦他们完成了，他们就会在社交媒体上发布。

youdao

Will you overlook it this once and forgive me, and let things go on as before?

你能不能原谅我这一次，让事情像以前一样继续下去？

youdao

Once they find the name, many rub a pencil on paper over the letters to copy it.

VOA: special.2009.05.25

It's based on a confusion. Once we see the confusion, we can see what the answer to our question is.

是在混淆概念,一旦弄清了混淆的地方,这个问题就好回答了

耶鲁公开课 - 死亡课程节选

So whether we finish it today, or more likely when we finish it up on Friday, once we get passed isoelectronic atoms, that's it, that's all you need to study for this first exam.

因此，我们也许今天讲完，或者更有可能周五讲完，无论如何，就到我们讲完等电子原子为止，这是你们第一次考试所需要准备的全部内容。

麻省理工公开课 - 化学原理课程节选

You can auto-upload (over WiFi and data, though you can opt out of the latter) your multimedia as you capture them, and once it arrives on the web app, it's easily downloadable or shareable, depending on what you want to do.

ENGADGET

Because once it's switched on it can't be switched off?

BBC: Murder trial told 'choke hold' led to doctor's death

Dell has shown how to sell PCs most efficiently, passing outfits like Compaq and IBM, which once looked down on it.

WSJ: Technology Makes Advances in Decade