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  1. toughen

    • IPA[ˈtʌfn]

    英式

    • v.
      make or become stronger or more resilient;make (rules or a policy) stricter and more harsh
    • verb: toughen, 3rd person present: toughens, gerund or present participle: toughening, past tense: toughened, past participle: toughened

    • 釋義

    動詞