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