As my own studies have advanced, I have been increasingly impressed with the functional similarities between insect and vertebrate societies and less so with the structural differences that seem, at first glance, to constitute such an immense gulf between them.
以前一直知道so可以替代宾语,但这句话中明显是替代主谓了,这是什么替代规则?
less so =I have been increasingly less impressed的省略形式