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
Waterfalls, watervapor,

瀑布水蒸气
Clouds, rain, springs,

云雨溪流
Rivers, seas, oceans, glaciers.

河海洋冰川
The cycle is never broken.

这一循环从未被打破
There's always the same quantity of water on earth.

地球上的水含量是恒定的
All the successive species on earth have drunk the same water.

地球上相继出现的物种喝的是相同的水
The astonishing matter that is water.

最惊奇的物质就是水
One of the most unstable of all.

最不稳定的物质之一
It takes a liquid form as running water,

液态是流水
Gaseous as vapor...

气态是水蒸气
Or solid as ice.

固态是冰