míng​jī​lòu​gǔ

to be engraved on one's mind

  1. to engrave
    (bound form) to engrave or carve on a hard surface; often used metaphorically to mean remembering something deeply and forever
  2. noun
    muscle
    (bound form) muscle; flesh
  3. to engrave
    (bound form) to engrave or carve; to chisel designs
  4. noun
    bone
    bone; the hard tissue that forms the skeleton of humans and vertebrate animals