ironclad
adj. 装甲的；打不破的；坚固的
n. 装甲舰
例句
These ironclad details are irrefutable proof in black and white.
白纸黑字，铁证如山。
《新英汉大辞典》
“THEY never come back” may be an ironclad law of boxing
“他们不会回来了”可能是铁腕法令的重拳出击
Ironically, Vista's failure stemmed from its ironclad security.
讽刺的是，Vista之败源自其铁桶一般的安全性。
