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(shì)發(fā)信號(hào)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(shí)羅馬人繼承希臘傳統(tǒng),就修建了賽馬場(chǎng)和露天競(jìng)技場(chǎng).

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