on the flat
成語所屬單字flat
on the flat — 慣用語
1. on ground that is level, not on a slope, hill, or raised section — used especial
1.慣用語
釋義
在平地上（尤指賽馬、自行車賽等運動中相對於有坡度的地面）
on ground that is level, not on a slope, hill, or raised section — used especially in horse racing, cycling, and athletics
例句
The horse is much faster on the flat than on hills.
Runners must save their energy for the final part of the race on the flat.