ironclad

形容词 C2

中文：装甲的、坚不可摧的、严格的

Covered with iron, steel, or (loosely) any other tough metal; armor-plated. · Unlike the average vehicle, cash delivery vans are ironclad and almost unstoppable.
Solid or certain; not able to be disputed or questioned; irrefutable. (figuratively) · The suspect had an ironclad alibi for his whereabouts on the night of the crime.
Rigorous; severe; exacting. (figuratively) · an ironclad oath or pledge
Stubborn; inflexible. (figuratively)

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