郑和七次下西洋， 哥伦布对美洲大陆的发明和麦哲伦的环球航行，都与指南针的利用分不开。
The Zheng He seven under Western world, Columbus to the Americas mainland's discovery with Magellan's sail around world, cannot separate with compass's application.
早在600多年前，中国就拥有世界上最庞大的郑和远洋舰队，七次下西洋也没有用于搞对外扩张。
As early as 600 years ago, China owned world's largest ocean-going fleet commanded by Adm. Zheng he. Though he made seven ocean voyages, no territorial expansions were ever made.
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