jellyfish were entirely free of predation. 水母完全摆脱了被捕食的危险

91. jellyfish were the first to venture out of the shallows
    水母率先冒险离开浅海
92. and into the big blue.
    进入巨大的蓝色海洋
93. Here, with fish yet to evolve,
    在这里 鱼类尚未进化
94. jellyfish were entirely free of predation.
    水母完全摆脱了被捕食的危险
95. In time, others would follow.
    随着时间的推移 其他生物也会跟随而来
96. But more than half a billion years ago,
    但是五亿多年前
97. the open ocean belonged to them.
    广阔的海洋属于它们

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 94 行