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vi.变坚韧；变顽固
vt.使…坚韧；使…顽固
1、tougher───较坚强的；较艰苦的（tough的比较级）
2、toughed───adj.艰苦的，困难的；坚强的，不屈不挠的；坚韧的，牢固的；强壮的，结实的；n.恶棍；vt.坚持；忍受，忍耐；adv.强硬地，顽强地；n.(Tough)人名；(英)图赫
3、toughens───vt.使…坚韧；使…顽固；vi.变坚韧；变顽固
4、toughies───n.恶棍；鲁莽的人；劲敌
5、toughened───adj.坚韧的；v.变坚韧；变顽强；变困难（toughen的过去分词）
6、toughest───adj.最坚强的；最坚韧的；最粗暴的；最苛刻的（tough的最高级）
7、roughen───vi.变粗糙；vt.使粗糙
8、toughener───n.[助剂]增韧剂
9、roughens───vi.变粗糙；vt.使粗糙
1、"One main problem is the abrasion factor, " he said. "You have to toughen up the skin on the bottom of your feet. "───“一个主要问题是磨损因素，”他说，“你不得不使自己足底的皮肤变得更坚硬。”
2、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。
3、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。
4、The European Union today unveiled draft legislation to toughen up the policing of financial institutions and avoid another banking meltdown.───欧洲联盟今天推出法律草案，将加强对金融机构的监管以避免另一次金融灾难。
5、Over a period of two or three weeks, these fibres meld together to form thin, wet sheets of cellulose that toughen as they are dried out.───经过2~3个星期，这些纤维素细丝相互形成薄薄的潮湿的一层纤维素垫子，当它们干燥的视乎就会变得非常坚韧。
6、However, urged by my renewed requests plus their intention to toughen my will in hard conditions, they finally agreed to let me have a try.───但禁不住我的再三请求，同时也想让我受点磨炼，他们终于答应让我试试。
7、Talks are under way to toughen trade restrictions.───加强贸易限制的会谈正在进行中。
8、Certainly it has not proven to be a workable solution in the Niger Delta, where it has only served to toughen the militants.───显然，这种办法在尼日尔三角洲被证明是行不通的，相反已让武装人员变得更强硬。
9、Visiting the Kurils is the latest in a series of moves by Mr Medvedev in a month, indicating that he is trying to toughen up his image.───视察南千岛群岛是梅德韦杰夫一个月来采取的一系列行动中最新的一个，表明他正试图让自己的形象变得更为强硬。
1、Do not add salt to beans when cooking as this tends to toughen the skins.