百年一遇的英文是什么?!

once in a hundred years
once in a century

an unusual occurrence in affairs of his nature

若是成语则单独翻译：a-hundred-year return period

百年

同意楼上的once in a hundred years

百年一遇
网络释义
百年一遇:a-hundred-year return period
百年一遇的海浪:one hundred year wave
百年一遇暴风雨:hundred-year storm