Demands for purer and cleaner river water

需要更纯净、更清洁的河水

Fresh beer without filtration is nutritional and tastes purer .

不经过滤的鲜啤酒营养更丰富，口味更纯正。

But Chinese people like their gold purer than their western counterparts : 24 carat , rather than 18 carat .

但中国人比西方人喜欢更纯的金子：24K而不是18K。

laboratories reproduce these molecules in a much purer form .

实验室把这些分子成分以更纯粹的形式重制出来。

How can he be a purer evil than satan ?

他怎么可能比撒旦坏得更纯？