17.分解固体和气体　

break down both solids and gases

16.一种极性微粒　　 a polar molecule

15.由两个氢原子和一个氧原子组成be made up if two hydrogen atoms and one oxygen atom

14.赋予水以独特的特性

give water it unique properties

13.水的化学结构 the chemical structure of water

12.范围从微生物一直到巨物ranges from the tiniest plankton all the way up to giants

11.海洋生命丰富、多样，令人难以置信

　marine life is incredibly rich and varied

10.大约30亿年前　 about three billion years ago

9.从中受益　　　　 benefit from

8.用这种方法使用水use water in this way