amphitheaters
n.
圆形露天剧场( amphitheater的名词复数 );
竞技场面;
（供观摩外科手术等的）梯形教室;
（剧场中的）阶梯式座位区;
例句:
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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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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.