In 7 th century BC, Romans inherited the traditions of Greece and built racetracks and unroofed amphitheaters.
公元前七世纪时罗马人继承希腊传统,就修建了赛马场和露天竞技场.
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Some amphitheaters could be filled with water so that ship battles could be fought.
一些这样的圆形竞技场还会被注满水以便表演海上作战的船只能够航行.
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