a "screw that never rusts" &mdash / sb who selflessly and wholeheartedly serves the Communist Party, like Lei Feng 雷鋒|雷锋[Lei2 Feng1], to whom the metaphor is attributed
无头苍蝇
wú tóu cāng ying
headless fly (a metaphor for sb who is rushing around frantically)
脱缰野马
tuō jiāng yě mǎ
a wild horse that refuses to be bridled (a metaphor for sth that runs wild)
牛毛
niú máo
ox hair (used as a metaphor for sth very numerous or sth fine and delicate)
跪乳
guì rǔ
(literary) (of a lamb) to kneel to suckle at the breast (used as a metaphor for filial piety)