shǐ nián qīng rén rèn zhēn 
nínshìfǒuzàixúnqiú:使年轻使年轻人认真负责使年轻 使年轻人认真负责gèngduōjiéguǒ...
yīngwénjièshì:
  1. n.  put an old head on young shoulders