laden with rock, 满载着岩石

152. were carved by those great mountain sculptors -
     这些杰作出自一位伟大的山峰雕刻家之手
153. the glaciers.
     冰川
154. Immense rivers of moving ice,
     一望无际的流动冰河
155. laden with rock,
     满载着岩石
156. grind their way down the mountains,
     碾磨出一座座尖峭的山峰
157. gouging out deep valleys.
     刨削出一个个深邃的山谷
158. They're the most powerful erosive force on our planet.
     它是地球上最大的侵蚀作用

来自《行星地球 第一季 第二集 Planet Earth S01E02 山地》第 155 行