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这句中的第一个by是什么意思,句子中起什么作用?aprocessbywhichsomethingproposed(asforresearchorpublication)isevaluatedbyagroupofexpertsintheappropriatefield顺便帮忙分析一下句子结构

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这句中的第一个by是什么意思,句子中起什么作用?
a process by which something proposed (as for research or publication) is evaluated by a group of experts in the appropriate field
顺便帮忙分析一下句子结构
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答案和解析
这个句子的主干是a process is evaluated by a group of experts,而by which something proposed则是修饰主语a process的从句,你可以把它看成something is proposed by a process,就可以明白by的作用了!