As a result, Life expectancy in the U. S. jumped from about 47 years at the beginning of the century to 76 now.是什么意思_As a result, Life expectancy in the U. S. jumped from about 47 years at the beginning of the century to 76 now.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句