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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	William Dwight William Edward W(illiam) E(dward) B(urghardt) William Ellery William Ewart William Felton William Ford William Frank, Jr. William Franklin William Frederick William Frederick William George William Gerald William H. William Harold William Harrison William Harrison William Henry William Henry William Henry William Henry William Henry William Henry William Henry Cavendish William Henry Fox

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