树林里有一个健身赛道。

There is a fitness ___circuit in the woods.

我去了举办F-1大奖赛的铃鹿赛道。

I went to the Suzuka ___circuit where the F-1 Grand Prix was held.

马拉松路线形成了环绕城市的圆形赛道。

The marathon route forms a circular ___circuit around the city.