front-to-back slope

例句：

1. 1.The car was driving down the front-to-back slope.
   汽车正在沿着前坡和后坡行驶。
2. 2.The mountain climbers were making their way up the front-to-back slope.
   登山者正在攀登前坡和后坡。
3. 3.The hikers followed the front-to-back slope to reach the summit.
   徒步旅行者沿着前坡和后坡到达山顶。