1.年级：高二
2.科目：英文
3.题目：One of them is condensation, ________ two or more unrelated, or even c
ontradictory, dream thoughts are combined to form one single element.

4.想法：答案是by which
我认为主词是dream-thoughts，所以dream-thoughts are combined by two or more unr
elated, or even contradictory to form one single element.
想请问这样解释对吗？
谢谢

Two or more unrelated, or even contradictory, dream thoughts are combined to form a single element by condensation.

请问这里的by是什么意思？

这好像是龙腾B4的课文? 可以把这里的by想成是through/inthe process of