请教一道阅读题

juliasun

When seawater is frozen, the dissolved materials are left behind. In this manner, seawater directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared. Of course, when this ice melts, it will tend to decrease the salinity of the surrounding water.

最后一句的it指什么？答案是sea water,为啥不是sea ice

普样2的最后一篇阅读里面。

vicomte

ice化了不就变成water了。

真正降低盐浓度的是化了的ice，也就是water，而不是ice本身。

我是这样理解的。