These strata are the product of those billions and billions of shells. 这些地层便是数以亿计的贝壳的产物

88. Dissolved in the ocean.
    从而长出贝壳
89. When they died, the shells sank...
    他们死去以后 贝壳沉没
90. And accumulated on the seabed.
    并沉积在海床
91. These strata are the product of those billions and billions of shells.
    这些地层便是数以亿计的贝壳的产物
92. Thanks to them, the carbon drained from the atmosphere,
    多亏他们 碳被从大气分离
93. And other life-forms could develop.
    其他生物得以发展
94. It is life that altered the atmosphere.
    是生命改变了大气

来自《家园 第一部分 Home Part1》第 91 行