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谁能帮我分析一下这个句子.主要是中间两个which之间的部分,

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谁能帮我分析一下这个句子.主要是中间两个which之间的部分,
We may define chemistry as the science in which we deal with the chemical change in matter as a result of which it is possible to form a new substance.
We may define chemistry as the science
in (the science) we deal with the chemical change in matter
as a result of (chemical change in matter )it is possible to form a new substance
第一个which修饰the science(=chemistry),定语从句,没什么好说的;
第二个which指代chemical change in matter,后面的It作形式主语.
我们可以把化学看作这样一门科学,它让物质间产生化学改变,而这一改变的结果,很可能形成新的物质.