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HSK levels

    一颗老鼠屎坏了一锅汤 一顆老鼠屎壞了一鍋湯

    yīkēlǎoshǔshǐhuàileyīguōtāng

    1. lit. one pellet of rat feces spoiled the whole pot of soup (idiom); fig. one bad apple can spoil the whole bunch