they made up three-quarters of all vertebrate life on land, 它们占据了陆地脊椎动物的四分之三

53. the volcanic eruptions turned it from a bottom-of-the-food-chain burrower...
    火山喷发使它从食物链底端的挖洞者
54. ...to the animal that inherited the Earth.
    变为地球的动物继承者
55. In the years following the mass extinction,
    在大灭绝之后的岁月中
56. they made up three-quarters of all vertebrate life on land,
    它们占据了陆地脊椎动物的四分之三
57. something no other animal has ever done.
    这是其他动物从未做到过的
58. But their dominance couldn't last,
    但它们的统治无法持续
59. for another survivor of the mass extinction
    因为大灭绝中的另一个幸存者

来自《我们星球上的生命 第一季 第四集 Life on Our Planet S01E04 冷血动物》第 56 行