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inexpugnable

英 [,ɪnɪk'spʌɡnəbl] 美

攻不破的

英文词源

inexpugnable (adj.): late 15c., from Latin inexpugnabilis "not to be taken by assault," from in- "not" (see in- (1) + expuglabilis, from expugnare (see expugn).