单词	toughen
释义	tough·en (tŭfən) tr. & intr.v. tough·ened, tough·en·ing, tough·ens To make or become tough. See Synonyms at harden. toughen·er n.
随便看	gray fox grayish gray jay graylag graylag gray langur grayling gray literature grayly graymail gray market gray matter gray mullet grayness graysby grayscale grayshirt gray squirrel graywacke graywater gray whale gray wolf Graz grazable graze

英语词典包含135693条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。