指南针的英语怎么写怎么写怎么写

　　The Historical Evolution of the Theory of Compass in China.

　　指南针理论在中国历史上的.演变。

　　The compass was invented in China two thousand years ago.

　　中国在两千年前发明了指南针。

　　The electronic compass is widely used in the navigation equipments recently.

　　近年来，电子指南针被广泛的运用于导航设备中。