He emphasized how little was known about the disease.

他着重指出对这种疾病所知甚少。

《牛津词典》

Until recently, not much was known about the topic, and little help was available to teachers to deal with bullying.

过去人们对这个话题所知甚少，老师们也很难得到帮助来应对欺凌问题，直到最近这个情况才发生了改变。

youdao

I wish we'd known about it beforehand.

要是我们预先知道这事就好了。

《牛津词典》

Yet sleep scientist Ying-Hui Fu at the University of California, San Francisco,says little is known about the basic need for sleep.

VOA: special.2009.08.26

But of course, a lot was known about these Mycenaeans well before the syllabary was deciphered.

当然,大量关于迈锡尼的知识,在那些表音文字被破译前就知道了

耶鲁公开课 - 古希腊历史简介课程节选

I had known about myself. I'm just interested in women.

我了解自己，我就是对女性感兴趣。

普林斯顿公开课 - 人性课程节选

Economists since David Hume in the 18th century have known about the smooth workings of unified currency systems.

FORBES: Dollarize Emerging Markets

"In the US a lot is known about the Holocaust, for example, " he says.

BBC: Magazine

The prosecutors alleged that even if Tobin hadn't known about the scheme, he should have.

FORBES: Magazine Article