Tā xiǎo shíhòu shì ge liúshǒu értóng, yéye nǎinai dài dà de.
He was a left-behind child, raised by his grandparents.
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A major social phenomenon since the 1990s: tens of millions of rural kids are left with grandparents while parents work in factories in coastal cities. The term carries real weight in Chinese policy and media discourse.