the solar calendar introduced in Rome in 46 b.c. by Julius Caesar and slightly modified by Augustus,establishing the 12-month year of 365 days with each 4th year having 366 days and the months having 31 or 30 days except for February是什么意思_the solar calendar introduced in Rome in 46 b.c. by Julius Caesar and slightly modified by Augustus,establishing the 12-month year of 365 days with each 4th year having 366 days and the months having 31 or 30 days except for February在线翻译_英语_读音_用法_例句