以貌取人

tā yòu fàn le yǐ mào qǔ rén de tōng bìng

他又犯了以貌取人的通病。

He fell into the common error of judging by appearances.

bù guǎn nǐ xǐ bù xǐ huan dà jiā dōu wǎng wǎng yǐ mào qǔ rén

不管你喜不喜欢，大家都往往以貌取人。

Like it or not, people are often judged by their appearance.

yǐ mào qǔ rén xiàng lái dōu bù shì hěn míng zhì

以貌取人向来都不是很明智。

It's never very wise to go by appearances.