世纪的第三个十年(如1820年代、1920年代、2020年代等)。
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世纪的第三个十年(如1820年代、1920年代、2020年代等)。；人生中从20岁到29岁的十年。；20至29的区间。；二十几岁；一生中20至29岁的十年；二十年代(1920年到1929年的时期)
The third decade of a century: the 1820s, 1920s, 2020s, etc.
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世纪的第三个十年(如1820年代、1920年代、2020年代等)。
The third decade of a century: the 1820s, 1920s, 2020s, etc.
人生中从20岁到29岁的十年。
The decade of one's life from age 20 through age 29.
20至29的区间。
The range between 20 and 29.
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Dictionary facts from ECDICT, WIKTIONARY.