To have an extremely robust physique; as tough as iron and steel; to be capable of bearing heavy responsibilities.
这位登山运动员虽然年纪大了，却依然铜筋铁骨，每次都能轻松征服险峻的山峰。
Although this mountaineer is advanced in age, he still possesses an extremely robust physique, easily conquering steep peaks every time.
Next Idiom