toughen
/ˈtʌfn/If you toughen something or if it toughens, you make it stronger so that it will not break easily. 使坚硬
verb [vt. 及物动词] vt. 使……坚韧；使……顽固
Months of walking barefoot had toughened his feet. 数月的赤脚行走已使他的双脚变得坚硬。
verb [vi. 不及物动词] vi. 变坚韧；变顽固
He thinks boxing is good for kids, that it toughens them up. 他认为拳击对孩子们有好处，使他们变得坚强。
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- The new law toughens up penalties for those that misuse guns. 这部新法律加强了对滥用枪支者的惩处。
- Nevertheless, researchers have discovered that a process long known to discolor and toughen foods may also contribute to age related impairment of both cells and tissues. 然而，研究人员发现，一个长期以来众所周知的使食物变色和变硬的过程也可能与年龄相关的细胞和组织损伤有关。
- They believe that participating in fights toughens boys and shows them how to be men. 他们认为参与打架可以使男孩们变得坚强，并且教会他们怎样成为男子汉。
- Talks are under way to toughen trade restrictions. 加强贸易限制的会谈正在进行中。
- They jab tree trunks to toughen their hands and practice squatting with other students sitting on their shoulders to build the leg strength. 他们猛击树干来锻炼双手，练习蹲坐，让其他同学坐在他们的肩膀上锻炼腿部力量。