verb 下载 🔗分享 使坚韧, 强化。 To make tough. Examples : "The difficult training regime is toughening the athletes for the upcoming competition. " 这种艰苦的训练正在使运动员变得更坚韧，以便迎接即将到来的比赛。(Zhè zhǒng jiānkǔ de xùnliàn zhèngzài shǐ yùndòngyuán biàn dé gèng jiānrèn, yǐbiàn yíngjiē jíjiāng dàolái de bǐsài.) quality condition process ability 与AI对话词汇游戏阅读练习
verb 下载 🔗分享 变硬，硬化。 To become tough. Examples : "The young tree is toughening up against the strong winds. " 这棵小树正在变得坚韧，以抵抗强风。 condition process quality body 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 增强，硬化。 The process of making something tougher. Examples : "The winter boots underwent a special toughening to make them more resistant to ice and snow. " 这些冬靴经过特殊的增强硬化处理，使其更耐冰雪。 process material technical 与AI对话词汇游戏阅读练习
