harden
verb- [intransitive, transitive]
to become or make something become solid or stiff （使）变硬，硬化 The varnish takes a few hours to harden. 清漆需要几个小时才能干透。 - harden something
a method for hardening and preserving wood 硬化和保存木料的方法
Extra ExamplesLeave the icing to harden in the fridge. 让糖衣在冰箱里变硬。 When the paint has hardened thoroughly, you can apply the next coat. 当油漆完全硬化后，你可以涂下一层。
- [intransitive, transitive]
if your voice, face, etc. hardens, or you harden it, it becomes more serious or severe （使声音、面孔等）更严肃，更严厉 Her face hardened into an expression of hatred. 她的脸沉下来，面带恨意。 - harden something
He hardened his voice when he saw she wasn't listening. 看到她没在听他讲话，他声音严厉起来。 His expression suddenly hardened into one of strong dislike. 他的表情突然变得非常不喜欢。
- [intransitive, transitive]
if somebody’s feelings or attitudes harden or somebody/something hardens them, they become more fixed and determined （使）更坚定，更强硬 - [transitive] harden somebody/something/yourself
to make somebody less kind or less affected by extreme situations 使变得无情；使不被打动 Joe sounded different, hardened by the war. 乔让人觉得变了，因战争变得冷酷无情了。 They were hardened criminals (= they showed no regret for their crimes). 他们都是死不悔改的罪犯。 In this job you have to harden your heart to pain and suffering. 做这项工作面对伤痛和折磨时你得保持沉着冷静。 Life has hardened me. 生活让我变得坚强。 I need to harden myself against disappointment. 我需要让自己坚强起来，以对抗失望。