thirties [ˈθɜ:ti:z]

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附加级

n.三十( thirty的名词复数 )；三十个；三十年代；一局中一方获得的第二分

She's in her mid-thirties. 她三十五六岁了。
In her twenties and thirties she had had no difficulty getting jobs. 她在二三十岁时找工作一点也不困难。来自《简明英汉词典》