Abstract : from a historical speculation of the development of international navigation , the thesis , by tracing back to zheng he ' s great feat of seven trips to the western seas , looks in to the future development trend on nautical technology in the 21st century 提要：从世界航海事业发展的历史考量中，追述伟大航海家郑和七下西洋的不朽功绩，展望新世纪航海技术的发展趋势。
According to the words in fleet ' s westwards journey and relevant descriptions in “ zheng he pilgrimage stele ” , i believe the actual date of zheng ' s fifth trip was a day between late april and early may in the 15th year of yongle ( 1417 ) 根据《舟师往西洋记》碑抄文和泉州《郑和行香碑》的相关记载，文章认为：郑和舟师第五次下西洋的具体出洋时间，应在永乐十五年（ 1417 ）四月末至五月上旬期间的某一天。
Ming dynasty , under the influence of the western odditily technique , some big graves even used " eight treasures turn axis " of the western an organization , particularly the emperor ' s mausoleum of manchu dynasty , be rated as a masterpiece that gather for several thousand years , anti - piracy technology of integral whole , the big warlord dianying sun wants to dig to open the east mausoleum , use the valuables which in the mausoleum acts as military payroll , starting large quantity troops , connecting to dig and explode used 5 or 6 days for successfuls , the its hard degree is imaginable “到了明代，受到西洋奇特技巧的影响，一些大的坟墓甚至用到了西洋的“八宝转心”机关，尤其是清代的皇帝陵墓，堪称集数千年防盗技术于一体的杰作，大军阀孙殿英想挖开东陵，用里面的财宝充当军饷，起动大批军队，连挖带炸用了五六天才得手，其坚固程度可想而知。 ”
He believes the reason that local rice wine and grape wine from the west can co - exist in today ' s china is because both are fermented alcohol , and thus relatively gentle , while china ' s spirits and scottish whiskey are first fermented and then distilled , endowing them with excessive alcoholic content which the typical person cannot handle 他认为本土的黄酒与西洋的葡萄酒正在中国合流，因为它们都同属发酵酒，相对柔和，而白酒和威士忌却须在发酵之后再被蒸馏，故酒精度太高，一般人受不了。
Abstract : nanjing was the capital city in early ming dynasty , as well as the place zheng he worked and lived for a long time . the position of the capital city , zheng he ' s relics all around nanjing , especially the site of longjiang treasure ship factory , show that nanjing was the original place of zheng he ' s expeditions to the western seas 提要：南京是明初的国都，也是郑和长期工作和生活的地方，无论从南京作为国都的地位，还是从遍布南京的郑和遗迹，特别是龙江宝船厂遗址的存在，都表明南京是郑和下西洋的策源地。
