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We may define chemistry as the sciece in which we deal with

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We may define chemistry as the sciece in which we deal with the chemical change in matter as a
result of which it is possible to form a new substance
我是想问which it is possible……中which在句中作什么成分了?it is possible to form a new substance 主 系 表都有了啊,which是什么?
We may define chemistry as the sciece in which we deal with
这是一个定语从句(其实是两个)which就是关系词:
第一个是in which引导限定定语从句,修饰science的;
第二个是of which引导的非限定定语从句,是修饰result的.