elevation zero

例句：

1. 1.The mountain top is at elevation zero.
   山顶海拔为零。
2. 2. The climber reached the summit at elevation zero.
   登山者在海拔零处达到了山顶。
3. 3. The car drove up to the elevation zero of the mountain.
   汽车开到了山的海拔零点。