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In ZhengHes fleets voyaging to the"Western Ocean".There were 44 zhang treasure ships,2000 liao seagoing vessels,1500 liao seagoing vessels,Eight-Oarvessels and so on.Ino ther words,Eight-Oar vessel was one of mainship-types in the fleets,the evidences have been recorded in an archaeological relic and a historical documentbelow:(1)a fragment of amemorial stone in the Jinghai temple at Nanjing,whichstates:”In the third year of Yongie period,the admiral led official troops to board and run 2000 liao vessel sand Eight-Oar vessels…….