in·ex·pug·na·ble /ˌɪnɪkˈspʌgnəbəl, ˈspjunə-/
(a.)不能攻占的,不能駁倒的
In·ex·pug·na·ble a. Incapable of being subdued by force; impregnable; unconquerable.
A fortress, inexpugnable by the arts of war. --Milman.
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inexpugnable
adj : impossible to take by storm [syn: impregnable]