Earth's great land masses merged, 地球各大♥陆♥合为一体

250. a tie that would be their undoing when conditions on Earth...
     当地球上的环境剧变时
251. radically changed.
     这种联♥系♥将使它们毁灭
252. During the period known as the Carboniferous,
     在石炭纪
253. Earth's great land masses merged,
     地球各大♥陆♥合为一体
254. and the supercontinent of Pangaea was born.
     超级大♥陆♥“盘♥古♥大♥陆♥”诞生
255. As the land dried,
     随着陆地变干
256. the vast swamps began to disappear.
     广阔的沼泽开始消失

来自《我们星球上的生命 第一季 第三集 Life on Our Planet S01E03 入侵大地》第 253 行