铭心镂骨

ming2 xin1 lou4 gu3

engraved in one's heart and carved in one's bones (idiom); to remember a benefactor as long as one lives, undying gratitude

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銘心鏤骨|铭心镂骨 [míng xīn lòu gǔ] ► engraved in one's heart and carved in one's bones (idiom); to remember a benefactor as long as one lives ► undying gratitude