求翻译：郑和是中国历史上最著名的航海家（maritime explorer）。公元1405 年，明朝的统治者为了稳固边防（border defense）和开展海上贸易，派郑和下西洋（the Western Seas）。在此后的28 年里，郑和带领船队七下西洋，前后出海的人员有10 多万人，访问了30 多个国家和地区。船队纵横南亚、西亚，一直到非洲。郑和下西洋是世界航海（navigation）史上的壮举，它展现了郑和卓越的航海和组织才能，同时展现了明朝的国力和国威（national strength and prestige），加强了明朝和海外各国之间的关系。是什么意思？

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Mr Cheng and the history of China's most famous seaman maritime explorer). The year 1405, the rulers of the Ming Dynasty, in order to secure the border (border defense and maritime trade, Mr Andrew CHENG and the Atlantic (the western seas). In the intervening 28 years, Mr Andrew Cheng and lead the f

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Is history's most famous Chinese Navigator Zheng He (maritime Explorer). 1405 ad, Ming dynasty rulers in order to secure the border (border defense) and sea trade, sent expeditions (the Western Seas). After 28 years, the fleet of Zheng He led seven voyages, sea personnel before and after more than 1

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