金蝉脱壳yīngwénjièshì:
  • n.  escape like a cicada by casting off its skin; stratagem for slinking off
  • n.  disappearance act from an entangled situation
  •   escape like a cicada by casting off its skin
  •   stratagem for slinking off

(fēizhùcèchéngyuánměiyèzànxiàn 4 lì)