concave slope

例句：

1. 1.The mountain is shaped like a concave slope.
   这座山像凹形坡度一样。
2. 2. The car drives down the concave slope.
   汽车沿着凹形坡度行驶。
3. 3. The path follows the concave slope of the hillside.
   小路沿着山坡的凹形坡度。