His muscles became hard as iron, and he grew callous to all ordinary pain.

他的肌肉变得像钢铁般强硬, 一般的疼痛对他来说已经不值一提。

But it is not so hard as iron, for it is easily scratched by an iron nail.

不过它的硬度又比不上铁，因为我们可以用铁钉轻松地在铜的表面留下刮痕。

Men felt these muscles and proclaimed them hard as iron, and the odds went down to two to one.

人们摸着这一块块肌肉说，坚硬得如钢铁一样，于是赌注的比例降到了二比一。

I am the rightful king, he had declared, his jaw clenched hard as iron, and your son no less a traitor than my brother here. His day will come as well.

我是合法的国王，他宣称，说话时下巴像钢铁一样紧绷，而你儿子和我弟弟一样都只是叛徒。他也有末日来临的那一天。