惹是生非

nǐ men yào nǔ lì xué xí bù yào rě shì shēng fēi

你们要努力学习，不要惹是生非。

You must study hard and don't stir up trouble.

wǒ dì di de pí qi hěn bào zào cháng xǐ huan zài wài miàn rě shì shēng fēi

我弟弟的脾气很暴躁，常喜欢在外面惹是生非。

My brother is ill-tempered, and likes to stir up trouble outside.