The difference between split-level houses and duplex houses is that although both houses are at different levels, the height of duplex houses often exceeds the height of one person, which is equivalent to two floors, while the height of split-level houses is lower than that of one person, so people can see the second floor when standing on the first floor. Therefore, staggered floors are called "compression compound". In addition, the first and second floors of duplex buildings are often vertically projected, and the upper and lower areas are the same; However, the two (or three) floors of staggered type are not vertically overlapped, but staggered with each other in the form of unequal height.