iron-clad proof

• 铁证

iron-clad proof的用法和样例：

例句

1. Angele was not the symbol, but the proof of immortality.
   安琪儿不是人的不朽性的象征，而是它的铁证。
2. Being dateless on New Year's Eve is proof positive of a person's social and sexual undesirability.
   除夕时没有约会是社交上不受欢迎，而且缺乏性魅力的铁证。