If you describe a guarantee or plan as ironclad, you are emphasizing that it has been carefully put together, and that you think it is absolutely certain to work or be successful.
例句
...ironclad guarantees of safe passage...安全通行的绝对保证The case for testing now is ironclad.正在接受检验的这一论据牢不可破。
英汉词典释义
adj.
<美>严格的
an ironclad contract不可动摇的契约That is an ironclad fact that is beyond controversy.这是铁的事实,无庸置辩。
英英词典释义
Adjective
1. inflexibly entrenched and unchangeable;
"brassbound traditions""brassbound party loyalists""an ironclad rule"