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| 单词 | toughening |
| 释义 | toughenverb tough·en ˈtə-fən toughened; toughening ˈtə-fə-niŋ ˈtəf-niŋ transitive verb : to make tough intransitive verb : to become tough toughening verb1 as in strengthening to increase the ability of (as a muscle) to exert physical force weight lifting will help toughen those flabby muscles of yours Synonyms & Similar Words Relevance
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2 as in hardening to make able to withstand physical hardship, strain, or exposure hiking every morning through snow and ice toughened him considerably Synonyms & Similar Words
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3 as in stiffening to make more harsh, uncompromising, or severe attempts to toughen conditions under which waivers from military service would be permitted Synonyms & Similar Words
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