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| Russian | English |
| крайне редкий | exceedingly rare (Although some detectives are also registered CSIs, this is exceedingly rare in actual life. 4uzhoj) |
| крайне редко | in very rare cases (ART Vancouver) |
| крайне редко | once in a lifetime (used to describe something special that is not likely to happen to you again • An opportunity like this comes once in a lifetime. OALD Alexander Demidov) |
| крайне редко | rarely if ever (Alexander Demidov) |
| что встречается крайне редко | in very rare cases (Johnny Bravo) |