His books are not well known.

他写的书不太有名。

《牛津词典》

They have learned that the disease is not well known or easily recognized.

他们已经知道这种病并不广为人知，或并不容易被识别。

youdao

The innards of accessibility work are probably not well known by many readers.

可访问性工作的内部情况可能很多读者都不了解。

youdao

Rahman is not well known in the western world but he is very famous in his native India.

VOA: special.2009.02.20

The time was in the early 70s, so factory farming was not well-known, was not as dominated as it is today, but it still existed.

那时是70年代早期，工厂化养殖并不为很多人所知,也不如今天这样占主导地位，但当时已经出现了这种方式。

普林斯顿公开课 - 人性课程节选

And it's just like a platform for that; for artists both well-known and not so well-known.

它就像是个给有名的或者还不那么有名的艺术家提供的舞台。

在布莱恩公园 - SpeakingMax英语口语达人

The meaning of the Guy Fawkes mask is not well known outside protest groups.

BBC: V is for what? The meaning of the mask

Mr. DONALD RUMSFELD (Secretary of Defense): It is not well known, it was not well understood.

NPR: Gates Has Just Two Years to Make a Difference in Iraq

Though not well known, Mr Galgut, at 41, has a loyal following in his own land and abroad.

ECONOMIST: New fiction