He was mid thirties, with thinning, reddish blond hair which had been razor cut up the back. THE COMPANY OF STRANGERS (2002)Suddenly, she gave an exclamation which was echoed by a jolly-looking person in her early thirties. ADRIENNE AND THE CHALET SCHOOL (2002)
较常使用。在柯林斯辞典中， thirties 是1万个最常用词之一。
thirties 的定义—— 柯林斯 英语词典
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