英语翻译司南是我国春秋战国时代发明的一种最早的指示南北方向的指南器,到了宋代,劳动人民掌握了制造人工磁体的技术,制造了指

The south of the department is a guide device of a kind of direction of north and south of instruction initially invented in era in period in the Spring and Autumn and the Warring states of our country,by Song Dynasty,the working people mastered the technology of making artificial magnet,made the compass