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Meaning of 狗咬吕洞宾,不识好人心

Lookup via: Pinyin | Radicals
gǒu yǎo dòng bīn , shí hǎo rén xīn (Trad.: 狗咬呂洞賓,不識好人心)
a dog biting Lü Dongbin (idiom); to ill reward a person's kindness