fiftiesn.
英 'fɪftɪ | 美 'fɪfti
中文n. 五十；五十个；编号为50的东西\nadj. 五十的；五十个的；众多的
五十；五十个；编号为50的东西
adj. 五十的；五十个的；众多的
词根词源
fifties (n.)1826 as the years of someone\\'s life between 50 and 59; 1853 as the sixth decade of years in a given century. See fifty.
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