動詞 harden:

1. become hard or harder
   同義詞：indurate
2. make hard or harder
   同義詞：indurate
3. harden by reheating and cooling in oil
   同義詞：temper
4. make fit
   同義詞：season
5. cause to accept or become hardened to; habituate
   同義詞：inure, indurate

1. Hot steel is quenched to harden it.
   燒熱的鋼淬火使它堅硬。
2. His face hardened at the word.
   他聽到這話，臉沉了下來。
3. Life in the camp had hardened him considerably.
   軍營生活使他變得堅強多了。

hard.en

v.（動詞）
hard.ened,hard.en.ing,hard.ens
v.tr.（及物動詞）
To make hard or harder.
使硬化：使變硬或更硬
To enable to withstand physical or mental hardship.
使經(jīng)得起考驗：使能經(jīng)受住身體的或精神上的困苦
To make unfeeling, unsympathetic, or callous:
使無情：使沒有感情、無同情心或冷酷：
例句：
.To love love and not its meaning hardens the heart in monstrous ways.(Archibald MacLeish)
.不是用愛的本質(zhì)去愛，會使人在許多方面變得冷酷無情.(阿奇博爾德·麥克利什)

To make sharp, as in outline.
使輪廓鮮明
To protect (nuclear weapons) by surrounding with earth or concrete.
用圍墻保護：用泥土或混凝土圍住以保護（核武器）
v.intr.（不及物動詞）
To become hard or harder.
變硬或更硬
To rise and become stable. Used of prices.
變穩(wěn)定：上漲且變得穩(wěn)定。用于價格
To become inured.
變習慣

<參考詞匯><同義詞>harden,acclimate,acclimatize,season,toughenThe central meaning shared by these verbs is .to make resistant to hardship, especially through continued exposure.:
這些動詞所共有的中心意思是.使對艱難困苦有抵抗力，尤指通過連續(xù)的暴露于困難面前.：
例句：
was hardened to life on the frontier;
頑強地面對前線的生活；

例句：
is becoming acclimated to the tropical heat;
對熱帶的高度逐漸適應；

例句：
was acclimatized by long hours to overwork;
由于長時間的磨煉而適應超負荷勞動；

例句：
became seasoned to life in prison;
對監(jiān)獄的生活習以為常；

例句：
toughened by experience and criticism. soften
由于坎坷的經(jīng)歷和人們的指責而麻木不仁 soften