Each year nearly two million animals migrate across the Serengeti plains 每年都会有将近200万只角马 横越塞伦盖蒂平原

102. Now they are carrying heavy loads of sediment
     河流中带着大量的泥沙
103. that stains their waters brown.
     水变得很浑浊
104. Lines of wildebeest are on their march.
     一队队的角马正在迁徙途中
105. Each year nearly two million animals migrate across the Serengeti plains
     每年都会有将近200万只角马 横越塞伦盖蒂平原
106. in search of fresh green pastures.
     去寻找新鲜草场
107. For these thirsty herds
     对于这群饥渴难耐的角马来说
108. the rivers are not only a vital source of drinking water,
     河流不仅是唯一能解渴的重要水源

来自《行星地球 第一季 第三集 Planet Earth S01E03 淡水》第 105 行