the process of becoming or making something become solid or stiff 变硬: 变硬或变硬的过程hardening of the arteries 动脉硬化
the process of becoming less kind or more fixed and determined 强化: 变得不那么善良或更坚定和坚定的过程a hardening of attitudes towards one-parent families 对单亲家庭态度的冷漠化 Sandra answered with a sudden hardening of her tone. 桑德拉突然语气强硬地回答。 The sufferings of 1914–1918 led to a hardening of hearts. 1914-1918年的苦难导致了人们内心的硬化。