一顆老鼠屎壞了一鍋湯

一颗老鼠屎坏了一锅汤
lǎoshǔshǐhuàileguōtāng
  1. lit. one pellet of rat feces spoiled the whole pot of soup (idiom)
  2. fig. one bad apple can spoil the whole bunch

CEDICT

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