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问题: 高中英语句子分析

Even though the pure water is what gives sea water its main properties,the salinity of sea water affects both its weight and freezing point.Salt water has a lower freezing point and is heavier than pure water.
这个句子中的is what gives……的what的用法,

解答:

what 关系代词:所。。。。的事物或人 = that which 或those which 例:Show me what you have written. 把你所写的给我看看。
还=whatever 凡是。。。。的事物 例:You may say whatever you will. 你要怎么说就怎么说。