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Meaning of 永不生锈的螺丝钉

Lookup via: Pinyin | Radicals
yǒng shēng xiù de luó 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