永不生鏽的螺絲釘

永不生锈的螺丝钉
yǒngbùshēngxiùdeluósīdīng
a "screw that never rusts" – metaphor used in CCP propaganda to praise loyal, selfless contributors, famously applied to model worker Lei Feng 雷鋒 Léi Fēng

CEDICT

Entry Composition

1 永不 yǒngbù
  1. never
  2. will never
2 生鏽 shēngxiù
  1. (of metal) to rust; to become rusty
  2. (fig.) (of a skill etc) to get rusty; to deteriorate
3 的 de
  1. of; ~'s (possessive particle)
  2. (used after an attribute when it modifies a noun)
  3. (used at the end of a declarative sentence for emphasis)
  4. (used after a noun, verb or adjective to form a nominal expression, as in 皮革的 pígéde "one made of leather" or 跑堂兒的 pǎotángrde "a waiter (literally, one who runs back and forth in a restaurant)" or 新的 xīnde "new one")
  5. also pr. dì or di in poetry and songs
4 螺絲釘 luósīdīng screw