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Meaning of 永不生锈的螺丝钉

Lookup via: Pinyin | Radicals
永 yǒng 不 bù 生 shēng 锈 xiù 的 de 螺 luó 丝 sī 钉 dīng (Trad.: 永不生銹的螺絲釘)
a "screw that never rusts" — sb who selflessly and wholeheartedly serves the Communist Party, like Lei Feng 雷锋 , to whom the metaphor is attributed