long steep grade

例句：

1. 1.The car drove up the long steep grade to the top of the mountain.
   汽车沿着长长的陡坡开到了山顶。
2. 2. The hikers followed the long steep grade to reach the summit.
   徒步旅行者沿着长长的陡坡到达了山顶。
3. 3.The road was long and steep, making it difficult for the driver to navigate.
   这条路很长且陡峭，使得司机难以驾驶。