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toughening cure▼noun[UK: ˈtʌf.n̩.ɪŋ kjʊə(r)] [US: ˈtʌf.n̩.ɪŋ ˈkjʊr]
toughening method▼noun[UK: ˈtʌf.n̩.ɪŋ ˈme.θəd] [US: ˈtʌf.n̩.ɪŋ ˈme.θəd]
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