racetrack torus

例句：

1. 1. The racetrack is the perfect place for a horse to run.
   赛马跑道是一匹骏马奔跑的理想场所。
2. 2. The track was built to accommodate the large number of spectators.
   赛道是为了容纳大量的观众而建造的。
3. 3. The torus is a unique shape that has been used in many architectural designs.
   环形结构是一种独特的形状，已经被用于许多建筑设计中。