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the process by which water is changed into ice is called fre

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the process by which water is changed into ice is called freezing 为什么which前边用which而不是to,at ,for
ywhich是词组
再问: 问错了是为什么用by
再答: by还有的意思是以,,,方式,通过,,,的过程,
再答: to for 什么的没有这个意思