growing pains  
noun [ plural ] uk/ˈɡrəʊ.ɪŋ ˌpeɪnz/ us/ˈɡroʊ.ɪŋ ˌpeɪnz/
  (PHYSICAL PAIN)     
  发育期痛(青少年发育时骨头及关节的疼痛)
pains felt by young people in the bones or joints (= places where two bones are connected) of their legs
   (DIFFICULTIES)     
 (新建组织或新活动所经历的)初期困难,发展时期的困难
the problems of a new organization or activity