The theory has been superseded by more recent research.

　　這一理論已為新近的研究所取代。

　　I have this theory that most people prefer being at work to being at home.

　　依我看，多數人喜歡工作而不愿待在家里。

　　The comparison shows considerable disagreement between theory and practice.

　　這一對比表明理論和實踐之間有相當大的出入。

　　I accept his theories, but not without certain qualifications.

　　我接受他的理論，但并非毫無保留。

　　And that's where the theory falls down.

　　這就是該理論的不足之處。