| 例句 |
blue moonnoun a long or seemingly long period of timeonce in a blue moon we'll get dressed up and eat in a fancy restaurant aeon(or eon), age, coon's age, cycle, donkey's years(chiefly British), eternity, forever, long, months, moon infinitylifetime flash, instant, jiffy, minute, moment, second, shake, split second, trice, twinkle, twinkling, winkmicrosecond, nanosecond in 1821 |