永不生锈的螺丝钉yǒng bù shēng xiù de luó sī dīng释义a "screw that never rusts" – metaphor used in CCP propaganda to praise loyal, selfless contributors, famously applied to model worker Lei Feng 雷鋒|雷锋[Lei2 Feng1]单字详解永yong不bu生sheng锈xiu的de螺luo丝si钉ding