discover to 和 discover 有区别么?discover是vt.为什么会有discover to的用法?

请上上下文,没见过有discover to 用法,是不to后面跟着目的状语或是结果状语We discover to our gruesome dismay that those little beetles，who seem so fond of literature that they are forever racing around in our bookcases，continue the even tenor of their restless days minus two or three or four legs,这里的TO不是与discover一起的而是 to our gruesome dismay ，令我们极度惊恐的是。。。