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| Russian | English |
| исключительно редкий | once in a lifetime (шанс; idiom; An offer like that will come just once-in-a-lifetime. Val_Ships) |
| исключительно редкий (шанс или возможность | once in a lifetime (idiom; An offer like that will come just once in a lifetime. Val_Ships) |
| крайне редкая | once-in-a-lifetime (возможность; idiom Val_Ships) |
| крайне редкое событие | one-off event (Val_Ships) |
| столь же редкий | equally as rare |