tapering grade

例句：

1. 1. The road has a tapering grade that makes it easy to drive.
   这条路有缓坡，驾驶起来很易。
2. 2.The construction crew was working on a tapering grade to make the project more efficient.
   施工队正在修建一个缓坡，以使项目更加高效。
3. 3.The car's tires were designed with a tapering grade to improve handling and stability.
   汽车的轮胎设计有缓坡，以提高操控性和稳定性。