v.变硬，(使)硬化，(使声音、面孔等)更严肃，更严厉，(使)更坚定，更强硬，使变得无情
n.哈登

原形：harden第三人称单数：hardens过去式：hardened过去分词：hardened现在分词：hardening

His smile died and the look in his face hardened.
他的微笑消失了，脸上的表情突然显得严峻
The incident hardened his resolve to resign.
这件事情坚定了他辞职的决心。
The snow hardened until ice was formed.
雪逐渐硬化成冰。