They trim the grass down to its roots, leaving little in their wake, 这些角马拼命地吃草 把草根上面的草茎部分全部吃掉

50. The ravenous hordes devour the seeds.
    饥肠辘辘的群鸟贪婪地吞食着草的种子
51. And the leaves and stems are cropped by great herds of antelope.
    而叶子和茎则被巨大的羚羊群所享受
52. The East African savannahs alone sustain nearly two million wildebeest.
    仅生活在东非稀树大草原的角马 就接近两百万（注：角马属羚羊的一种）
53. They trim the grass down to its roots, leaving little in their wake,
    这些角马拼命地吃草 把草根上面的草茎部分全部吃掉
54. but within days the plant will recover
    然而被吃掉的那部分仅在数天之内就能恢复生长
55. and continue to sustain the biggest herds on Earth.
    草便又继续维系着地球上 最大的动物群落的食物需要
56. Grass is not confined to the tropics.
    草不仅生长在热带地区

来自《行星地球 第一季 第七集 Planet Earth S01E07 伟大草原》第 53 行