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

50. Lystrosaurus's simple but adaptable lifestyle
    水龙兽简单但具有适应性的生活方式
51. would reap astonishing rewards.
    将带来惊人的回报
52. Facing little competition and no large predators,
    竞争很少 而且没有大型捕食者
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

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 53 行