be known by sth.

通过...可以了解某人

有句谚语:
A man is known by the company he keeps.近朱者赤，近墨者黑

a bird is knwon by its note, a man is known by his talk .观鸟察其鸣，观人察其言

be known by sth.
某人/某物以...为人们所知

例句：A bird may be known by its song，and a man by his talk. 闻其歌知其鸟，听其言知其人。

A man is known by his friends. 什么人交什么朋友。

因什么而著名~
He is known by eating~