That have succeeded one another on earth over nearly four billion years. 无数生命链上的一环

16. Yet this was where the miracle of life occurred.
    然而 这里却是生命奇迹诞生的地方
17. Today, life- our life-
    今天 生命 我们的生命
18. Is just a link in a chain of innumerable living beings...
    只不过是四十亿年来 地球上接连出现的
19. That have succeeded one another on earth over nearly four billion years.
    无数生命链上的一环
20. And even today,
    直至今天
21. new volcanoes continue to sculpt our landscapes.
    新火山继续塑造着地表风貌
22. They offer a glimpse of what our earth was like at its birth.
    可以从中窥到地球起源时的一斑

来自《家园 第一部分 Home Part1》第 19 行