To make or become callous.
变硬使变硬或变硬结茧
Hardening means making harder .
淬火就是促使变硬。
harden by reheating and cooling in oil.
通过重新加热并在油中冷却来使变硬。
hardening something by heat treatment.
通过热处理使某物变硬。
The heat of the sun hardens clay.
太阳的热使黏土变硬。
a stiff coarse fabric used to stiffen hats or clothing.
使衣服或帽子变硬的硬的粗糙的纤维。
To make or become tough.
使坚强使或变得坚强、强硬、强壮、坚韧
having skin made tough and thick through wear.
通过磨损使皮肤变硬或变厚。
(cause sth to)become firm,hard or rigid from a soft or liquid state
（使某物） 由软变硬或由液态变成固态
the act of making something harder (firmer or tighter or more compact).
使某物变硬的行为（坚硬或牢固或更加紧凑）。
Terror blunted her feelings; deaden a sound.
恐怖使她的知觉变得特别生硬；使声音变弱。
It makes me cross and my hand get so stiff.
它使我烦躁。我的手变得那么硬。
The horror petrified his feelings; Fear petrified her thinking.
恐怖使她的表情变得非常生硬。
By the heat of the sun wax be soften , and yet clay be harden .
太阳的热可使蜡软化，但也可粘土变硬。
(cause sth to)become full of ice or hardened with ice
（使某物）结满冰或由于结冰变硬
They harden clay by putting it in a fire.
他们把粘土坯放在炉火里使其变硬。
harden steel by adding carbon.
通过增加炭元素使钢铁变硬。
Stiffen the cream by adding gelatine.
通过增加白明胶使奶油变硬。