Semi-detached housing consists of pairs of houses built side by side as units sharing a party wall and usually in such a way that each house's layout is a mirror image of its twin. this style is sometimes colloquially called a duplex; elsewhere, however, "duplex" refers to a building split into two flats/apartments (one above the other). The style is usually referred to in the mid-Atlantic (particularly Philadelphia) as a twin. % r0 R, c, X* q) \$ U( C$ i4 R- a( K0 X # Q7 |( Q( }4 Y) H W8 B+ _, U7 U. f就是一个房子俩家了。应该和RF2差不多吧