Question

帮忙翻译下~~~~谢谢，不要机器翻译~~

Sea commerce depended crucially on the mariner's compass, one of three inventions of world-historical note that emerged in China in this period. The others were gunpowder, which by late Sung was being applied extensively in warfare, and book printing, first by the woodblock method and later ,though never as importantly, by movable type.

Answer 1

指南针的发明对海上贸易起到了重大作用，指南针是史实记载的当时中国的三大发明之一，另外两个是印刷术和后来被宋代广泛应用于战争的火药。