gradient of equal traction

例句：

1. 1. The gradient of the mountain is steep.
   这座山的坡度很陡。
2. 2. The gradient of the road is changing as we go further down.
   随着我们继续往下走，道路的坡度在变化。
3. 3. The gradient of the river is important for navigation.
   河流的坡度对航行很重要。