UK在平地上
to be on a level surface, not on a slope or hill
Most of the path is on the flat. 这条小径大部分都在平地上。
The first ten or so miles of the walk are on the flat but after that, there are a few hills.
Pushing a stroller is one thing when you're on the flat but quite another when you're going uphill.
The pony races are all on the flat.
Now we're on the flat, I'm finding the walk a little easier.
See also: flat noun (LEVEL GROUND)