1. （使）变硬;（使）硬化
    When something hardens or when you harden it, it becomes stiff or firm.

harden的翻译

    e.g. Mould the mixture into shape while hot, before it hardens...
           在混合物还没有变硬之前，趁热将它塑成形。
    e.g. Give the cardboard two or three coats of varnish to harden it.
           在纸板上涂两三层清漆使其变硬。

2. （使）（态度、想法）变得更坚定;（使）变得更强硬
    When an attitude or opinion hardens or is hardened, it becomes harsher, stronger, or fixed.

harden的解释

    e.g. Their action can only serve to harden the attitude of landowners...
           他们的行动只会让土地拥有者的态度变得更坚定。
    e.g. The bitter split which has developed within Solidarity is likely to harden further into separation.
           团结工会内部已产生的不愉快分歧可能会进一步演变为分裂。

3. （价格、经济）变得更稳定
    When prices and economies harden, they become much more stable than they were.

harden的反义词

    e.g. Property prices are just beginning to harden again.
           房地产价格刚开始重新趋于稳定。

4. （使）变得坚强;（使）变得冷酷无情;（使）变得麻木不仁
    When events harden people or when people harden, they become less easily affected emotionally and less sympathetic and gentle than they were before.

    e.g. Her years of drunken bickering hardened my heart...
           她多年来醉酒寻衅的恶习让我变得麻木。
    e.g. She was hardened by the rigours of the Siberian steppes...
           西伯利亚大草原的艰苦环境使她变得坚强起来。

5. （表情、眼神）变得严肃，变得不快
    If you say that someone's face or eyes harden, you mean that they suddenly look serious or angry.

harden是什么意思

    e.g. His smile died and the look in his face hardened.
           他的笑容消失了，脸上的表情严肃了起来。