- the glaciers.
冰川 - Immense rivers of moving ice,
一望无际的流动冰河 - laden with rock,
满载着岩石 - grind their way down the mountains,
碾磨出一座座尖峭的山峰 - gouging out deep valleys.
刨削出一个个深邃的山谷 - They're the most powerful erosive force on our planet.
它是地球上最大的侵蚀作用 - 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