在30年代中期
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by the mid-thirties
到了三十多岁
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Physically, that means an aspiring professional has to start serious training by her mid-thirties at the latest, but realistically, very few achieve professional status after their mid-twenties;
从生理上说，这意味着一位上进的职业选手必须在最晚三十岁中期前开始认真训练。但实际上，很少人在三十岁中期后会取得职业地位；
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