一颗老鼠屎坏了一锅汤 (一顆老鼠屎壞了一鍋湯) yī kē lǎoshǔ shǐ huàile yī guō tāng

yī kē lǎoshǔ shǐ huàile yī guō tāng phrase a piece of rat feces spoiled the whole pot of soup; one bad apple can spoil the whole bunch
Domain: Proverb 谚语
Notes: (CC-CEDICT '一顆老鼠屎壞了一鍋湯')