some reptiles have grown to epic proportions. 一些爬行动物长得异常巨大

121. have had little competition or predators,
     几乎没有竞争对手和捕食者
122. until now.
     直到这一刻的到来
123. With the planet recovering,
     随着地球的复苏
124. some reptiles have grown to epic proportions.
     一些爬行动物长得异常巨大
125. This is an Erythrosuchid.
     这是引鳄
126. Nearly three meters long, it's the biggest predator of its time.
     长近三米 是当时最大的捕食者
127. Herds of Lystrosaurus are an easy target.
     水龙兽群很容易受到攻击

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 124 行