they were able to separate into layers of individuals, 但还是能够分离成数层个体层

74. or risk extinction.
    否则就会面临灭绝的风险
75. And one group adapted in a way never seen before.
    有一群生物以前所未见的方式 适应了这种转变
76. Despite being single animals,
    尽管是单独个体的动物
77. they were able to separate into layers of individuals,
    但还是能够分离成数层个体层
78. that then broke free.
    然后独♥立♥出来
79. Jellyfish.
    那就是水母
80. 530 million years ago,
    5.3亿年前

来自《我们星球上的生命 第一季 第二集 Life on Our Planet S01E02 第一前线》第 77 行