But it has been unclear whether individuals needed to experience intense emotions, similar emotions or both to produce a greater bond.
这句话的both to produce这both从语法结构讲,做什么句子成分?
这句话的结构是:...experience A, B or both(A+B) to produce... A, B or both 为experience的宾语,to produce不定式为状语,根据语境可以表示结果或目的。
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