上游高地的降雪逐渐堆积直到变成冰，再向下流入冰川。
Snowfall on the highlands upstream is gradually buried and compressed until it becomes ice, and the ice flows downhill into the glacier.
由于冰只局限在高地和极区，所以每年流水搬运的岩屑比冰所运走的多得多。
Because ice restricted to high altitudes and to polar regions, running water moves far more rock debris each year than ice does.
应用推荐