fifties 是 fifty 的變化形fiftyKK [ˋfɪfti] /ˈfɪfti/發音形容詞1五十的、五十個About fifty people showed up for the free concert.大約有五十個人來看這場免費演唱會。名詞1五十Twenty-five plus twenty-five equals fifty.二十五加二十五等於五十。2五十歲She started learning the piano at fifty.她五十歲才開始學鋼琴。3五十元鈔票口語Do you have change for a fifty?你有零錢可以換這張五十元的鈔票嗎。4五十幾歲常用複數Most of the volunteers are in their fifties.大部分的志工都是五十幾歲。5五十年代常用複數This style of furniture was popular in the fifties.這種風格的家具在五十年代很流行。