sloping front boundary

例句：

1. 1. The roof of the house is sloping slightly towards the south.
   这座房子的屋顶略微向南倾斜。
2. 2.The road slopes down to the river.
   这条路向下游倾斜。
3. 3. The car was sloping when it hit a pothole.
   汽车在遇到一个坑洼时开始倾斜。