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主we 谓may define 宾chemistry 后面的是定语从句the science in which we deal with the chemical change in matter as a result of which it is possibile to form a new substance 先行词the science in matter as a result of which it is possibile to form a new substance是介词短语做状语 但是这个里面还有一个of后面的宾语从句
1年前
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