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 date what is the meaning? What is the matter? what is the story What is the happiness? What is the love? what is the pencil what is the matter? what is the matter? what is the love? what is the fuck? What is the man? what is the hell what is the time what is the problem what is the trick? what is the mean?what is the mean?what is the mean?what is the mean?