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| Russian | English |
| демонстрировать железную логику | exhibit flawless logical reasoning (Alex_Odeychuk) |
| железная логика | flawless logical reasoning (Alex_Odeychuk) |
| железное здоровье | cast-iron constitution (перен.: Ernest has a cast-iron constitution and never gets sick. 4uzhoj) |
| железный довод | airtight argument (4uzhoj) |
| иметь железные доказательства | have someone dead to rights (чьей-либо вины: Did you ever have a suspect dead to rights, and look the other way on a piece of evidence that might have let him walk? • Some of you, we have dead to rights; others, the facts are less clear. 4uzhoj) |
| с железными нервами | of iron nerve (e.g.: "He was always a man of iron nerve (...)" – Sir Arthur Conan Doyle ART Vancouver) |