the ice itself is constantly moving, 冰川也在不断移动

158. They're the most powerful erosive force on our planet.
     它是地球上最大的侵蚀作用
159. A moulin - a shaft in the ice opened by melt water as it plunges into the depths of the glacier.
     冰川瓯穴——由冰融水凿成的 直达冰川深处的圆筒状竖井
160. Like the water running through it,
     正如奔腾不息的流水
161. the ice itself is constantly moving,
     冰川也在不断移动
162. flowing down the valley with unstoppable force.
     一刻不停地刨蚀着深谷
163. Alpine glaciers may seem immense,
     阿尔卑斯冰川看起来已是无边无际
164. but they're dwarfed by those in the great ranges that divide the Indian subcontinent from Tibet.
     但它仍比不上分隔印度次大陆 和西藏的巨大山脉中的冰川

来自《行星地球 第一季 第二集 Planet Earth S01E02 山地》第 161 行