一粒老鼠屎坏了一锅粥
yī​lì​lǎo​shǔ​shǐ​huài​le​yī​guō​zhōu

bad apple

一粒老鼠屎坏了一锅粥 (一粒老鼠屎壞了一鍋粥) yī​lì​lǎo​shǔ​shǐ​huài​le​yī​guō​zhōu
bad apple
one small negative element or person that ruins an entire group or situation

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