区别就是两者都是合成词+water的短语，具体的不同如下
spring water中文意思是泉水
It is a kind of hot spring water， which contains the mineral base， to restore and transform it into weak alkaline water.
pure water中文意思是[化学] 纯水，净水纯净水
The bottle is sealed， and the label says "pure water".
