世纪的第四个十年(如1830年代、1930年代、2030年代等)。；三十( thirty的名词复数 ); 三十个; 三十年代; <网>一局中一方获得的第二分
世纪的第四个十年(如1830年代、1930年代、2030年代等)。
The fourth decade of a century: the 1830s, 1930s, 2030s, etc.
人生中从30岁到39岁的十年。
The decade of one's life from age 30 through age 39.
30至39的区间。
The range between 30 and 39.
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