1) A man is known by his friends .
观友知人。
2) Men are known By the company they keep.
观其友，知其人。
3) A friend who knows me well
知己友人
4) A man is known by the company he keeps[by his company].
察其友，知其人。
5) To study a man's physiognomy and know his character
观相知人
6) How the Americans View Friendship
美国人的友谊观
补充资料：知己
①非常了解自己并情谊深切：知己话｜士为知己者死。②彼此相知而情谊深切的人：海内存知己，天涯若比邻。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条