one-in-a-million occurrence, happening that almost never repeats itself

listen to the pronunciation of one-in-a-million occurrence, happening that almost never repeats itself
Английский Язык - Английский Язык

Определение one-in-a-million occurrence, happening that almost never repeats itself в Английский Язык Английский Язык словарь

one-in-a-million occurrence, happening that almost never repeats itself
rare phenomenon