racetracks
n.
跑道，赛马场，赛车场( racetrack的名词复数 );
例句:
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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.
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BrIt'system of signalling by hand signs used by bookmakers at racetracks.
堵住登记经纪人在跑道上用手势发信号的系统.