what is the avreage life span at the beginning of the 20th century翻译

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whatistheavreagelifespanatthebeginningofthe20thcentury翻译whatistheavreagelifespanatthebeginningofthe2

what is the avreage life span at the beginning of the 20th century翻译
what is the avreage life span at the beginning of the 20th century翻译

what is the avreage life span at the beginning of the 20th century翻译
20世纪初的平均寿命是多少?