钢筋铁骨

Explanation: Bones like iron and steel casting to play the general. Described as physically fit and strong or strong-willed and unyielding. 　　Usage: Joint type; as object, attribute; with compliment 　　Source: Cao Yu, "half-day" travel "": "mat and placed in a variety of weightlifting equipment in the room, I met a group of reinforced steel frame of the youth." 　　Examples: Camped and marched out of a ~ temper, utter devotion. ★ "People's Literature," No. 8, 1977