Unlike limited petroleum and mineral reserves, deep-sea water, constituting 80 % of all ocean water, is practically inexhaustible, since it's constantly replenished by rain and fresh water from the land.
不像石油、礦產有枯竭之虞，地球海水中，深層海水佔了 80％，加上降雨和地表水源源流入，經過時間孕育，深層海水幾乎是取之不盡。