Overall between 30% and 50% of what has been bought in developed countries is thrown away by the purchaser.

总的来说，在发达国家购买的东西有30%到50%被购买者扔掉了。

youdao

Much of what has been written about us is out-and-out lies.

关于我们的报道大多都是彻头彻尾的胡编乱造。

《柯林斯英汉双解大词典》

So what has been learnt?

我们从中得到了什么教训呢？

youdao

That person won a battle with what has been called one of nature's fiercest creatures.

VOA: special.2011.03.15

And, as I mentioned a moment ago, we will return to this question of what has been interestingly called the young Milton's "chastity fetish."

正如我刚才提到的，我们回到这个,被风趣的称为,年轻弥尔顿的“贞洁崇拜“的问题上来“

耶鲁公开课 - 弥尔顿课程节选

And in these experiments we not only need to learn what has been learnt, but also have to learn what it is that we don't know.

在这些试验里我们不仅,要知道已知的知识，还要知道,我们不知道的内容。

麻省理工公开课 - 媒体、教育、市场课程节选

Essentially, what has been done is to automate the knowledge base of an oncologist.

FORBES: IBM's Watson: Maybe The Doctors Will Strangle It At Birth

But let me remind you, first of all, what has been done in remarkable time.

WHITEHOUSE: Press Briefing

The figures record what has been going on rather than what is about to happen, however.

ECONOMIST: Inflation