In which every being has a role to play... 在平衡中 一切都有属于自己的角色
It forms a protective mantle against the cold, 它形成了抵御寒冷的保护性掩体
It takes a liquid form as running water, 液态是流水
The earth's water cycle is a process of constant renewal. 地球的水循环是一个持续更新的过程
Once upon a time, the grand canyon was a sea inhabited by microorganisms. 从前 大峡谷曾经是微生物居住的海洋