1. These racehorses come of excellent stock.
   这些赛马来自优良的马种。
2. an exerciser of racehorses.
   赛马的训练者
3. a fine racehorse.
   经过极强训练的赛马
4. The past performance of a racehorse.
   赛马过去的表现
5. A racehorse that runs well on a wet or muddy track.
   泥腿子赛马一种在湿的或泥泞的赛场上跑得很好的赛马

　1个名词解释