Píngjià yí ge rén, bù néng zhǐ kàn wàibiǎo de yánchī.
You can't judge a person only by whether they look beautiful or ugly.
Tips
usage
A literary pair: 妍 "beautiful" plus 媸 "ugly". Everyday Chinese says 美 and 丑 instead. It often follows a verb of judging, as in 不辨妍媸 "unable to tell beauty from ugliness".
