[法] 铁证; 确证
1. Legal procedure requires China to provide ironclad proof of one's guilt before demanding a foreign country to extradite the criminal.
2. Some of the confidence US officials expressed about bin Laden's involvement in the London attacks is based on analytical judgment rather than ironclad proof.
3. This is ironclad proof of his treacherous acts and his role as a pawn of the US in coercing China.