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Meaning of 一颗老鼠屎坏了一锅汤

Lookup via: Pinyin | Radicals
一 yī 颗 kē 老 lǎo 鼠 shǔ 屎 shǐ 坏 huài 了 le 一 yī 锅 guō 汤 tāng (Trad.: 一顆老鼠屎壞了一鍋湯)
lit. a piece of rat feces spoiled the whole pot of soup (idiom); fig. one bad apple can spoil the whole bunch