【導(dǎo)讀】floor地板層。thefirstfloor. thesecondfloor. thethirdfloor. thefourthfloor. thefifthfloor. thegroundfloor. InAmericaInBritain. thefirstfloor. thesecondfloor. thethirdfloor. thefourthfloor. thefifthfloor. It’soverthere.classroom. first. library. third