郑和下西洋是世界航海史上的壮举，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，加强了明朝和海外各国之间的关系。
It shows Zheng He's outstanding talent of navigation and organization that he went to the western seas, a heroic undertaking in the world navigation history, which not only shows the national strength and prestige but also strengths the relationship with overseas countries for Ming Dynasty.