I understood the first part of the lecture, but when he started to talk about quantum physics he lost me completely. 讲座的第一部分我听懂了，但是当他开始讲量子物理学之后我就完全被搞糊涂了。She assumed from his expression that he was confused.她从他的表情上推断，他被搞糊涂了。I must admit, I'm completely baffled.我必须承认，我完全被搞糊涂了。