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》

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youdao

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