在R中以列方式组合两个列表列表

I am working with two separate lists of lists of data frames. They are the exact same dimensions. I am trying to combine each data frame (which resides in a list of a list) with the other data frame (which resides in the other list of a list). I believe I will need to use some combination of mapply and sapply, but I cannot figure it out. Here is what I have so far:I am working with two separate lists of lists o