BrIt'system of signalling by hand signs used by bookmakers at racetracks.
堵住登記經(jīng)紀(jì)人在跑道上用手勢發(fā)信號的系統(tǒng).
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In 7 th century BC, Romans inherited the traditions of Greece and built racetracks and unroofed amphitheaters.
公元前七世紀(jì)時羅馬人繼承希臘傳統(tǒng),就修建了賽馬場和露天競技場.
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