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pram (n.)[pram 词源字典]: "baby carriage," 1881, shortening of perambulator, perhaps influenced by pram "flat-bottomed boat" especially a type used in the Baltic (1540s), from Old Norse pramr, from Balto-Slavic (compare Polish prom, Russian poromu "ferryboat," Czech pram "raft"), from PIE *pro-, from root *per- (1) "forward, through" (see per).[pram etymology, pram origin, 英语词源]