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.
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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。