There's always the same quantity of water on earth. 地球上的水含量是恒定的

101. Clouds, rain, springs,
     云 雨 溪流
102. Rivers, seas, oceans, glaciers.
     河 海 洋 冰川
103. The cycle is never broken.
     这一循环从未被打破
104. There's always the same quantity of water on earth.
     地球上的水含量是恒定的
105. 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
106. The astonishing matter that is water.
     最惊奇的物质就是水
107. One of the most unstable of all.
     最不稳定的物质之一

来自《家园 第一部分 Home Part1》第 104 行