little-known fact 鲜为人知的事实
one little-known fact 鲜为人知的事实 ; 一个鲜为人知的事实
well-known fact 众所周知的事实
A Well Known Fact 一个众所周知的事实
a known fact 大家知道的事实
It's a known fact 这是个众所周知的事实
a fact known to few 很少人知道的事实
known multiplication fact 已知的乘法事实
以上来源于: WordNet
He often commented on the fact that he was best known for a part he played for only three years.
VOA: special.2010.03.07
In fact, of all the systems of cellular differentiation that are known in our bodies, probably hematopoiesis is the best known.
事实上,我们体内已知的,所有由细胞分化成的系统中,造血系统也许是最为人所熟知的
By the way, I've never known whether it is a fact.
其实我也从来都不知道这句话这是不是真的。
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