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宦官郑和屡次下南洋。第一次航行发动于1405年,计有大船62只,小船225艘,上载军民27800人,最大的船,长440英尺.宽186英尺,即次级之船亦有370英尺长,横宽150英尺。这样的巨船只见于书刊不见于实物,可是1957年考古学家在当日船厂附近发现有船舶舵等一桩,经过估计,其舵叶之高宽都应当在20英尺以上。郑和曾前后下南洋7次,最后一次航行于1432年间,已在朱棣之身后。在后面主持此次派遣的乃是朱棣之孙朱瞻基,明朝的第5个皇帝。平均计算起来,这7次航行中每次费时20个月。这舰队曾在马六甲海峡
Zheng He repeatedly went to Nanyang. The first voyage took place in 1405. There were 62 large ships, 225 small boats, 27,800 military and civilians, the largest ship, 440 feet long and 186 feet wide, ie the submarine ships were also 370 feet long and 150 wide. foot. Such giant ships were found in books and magazines not seen in kind, but in 1957, archaeologists discovered a ship rudder and so on near the shipyard on that day. It was estimated that the width of the rudder blades should be more than 20 feet. Zheng He once went to Nanyang 7 times before and after, and his last sailing in 1432 was behind Zhu Xi. It was Zhu Ziji, the grandson of Zhu Xi, and the 5th emperor of the Ming Dynasty. On average, each of the seven voyages took 20 months. This fleet once served in the Straits of Malacca