以下为句子列表：
英文: A horseracing enthusiast, especially one who watches races at the outer rail of the track.
中文: 比赛狂赛马的迷恋者，尤指在跑道外侧栅栏处观看比赛的人
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英文: He and a friend used math to develop a system for picking winners in horseracing and started selling theirStable-Boy Selectionstip sheets until they were shut down for not having a license.
中文: 他和一个朋友利用数学知识开发了一个在赛马比赛中选拔冠军的识别系统，然后开始推销他们的马童筛选器的内部消息传单，但因为无许可证被迫关停。
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