耳闻

ěr wén bù zú yǐ wéi píng

耳闻不足以为凭。

One cannot rely on hearsay.

tā zhǐ bu guò shì ěr wén bà le

他只不过是耳闻罢了。

He just heard it somewhere.

zhè shì céng ěr wén xiáng xì qíng kuàng bù shi hěn qīng chu

这事曾耳闻，详细情况不是很清楚。

I've heard about it, but I don't know the details.

zhè jiàn shì wǒ zhǐ yǒu suǒ ěr wén dàn bìng bù zhī dào qí zhōng de xì jié

这件事我只有所耳闻，但并不知道其中的细节。

I've only heard a little about it, but I don't know the details.