(noun.) the musical interval between one note and another four notes away from it.
(noun.) following the third position; number four in a countable series.
(adj.) coming next after the third and just before the fifth in position or time or degree or magnitude; 'the quaternary period of geologic time extends from the end of the tertiary period to the present' .
卡斯特罗校对
珍妮特手打