altitude difference

例句：

1. 1. The mountain climbers were measuring the altitude difference between their starting point and the summit.
   登山者正在测量他们的起点和山顶之间的海拔差。
2. 2. The scientists used a satellite to measure the altitude difference between the Earth and the moon.
   科学家们使用卫星来测量地球与月球之间的海拔差。
3. 3.The hikers were surprised by the altitude difference they encountered during their trek.
   徒步旅行者在他们的行程中遇到了令人惊讶的海拔差。