the first floor是什么意思及用法

我们的房间在二楼，他们的房间在三楼。 The second-floor framing was not appreciably affected and only a few of the first-floor joists were fractured第二层楼板构架所受影响较小，只有第一层楼板少数托梁裂断。 The floor of the den had fallen through, and all the treasures we had tried to save were now on the first floor, under the stealthily rising river小书斋的地板已经塌陷下去，我们一直没法保全的珍贵瓷器如今都落到楼下的地板上了，淹没在不停暗涨的河水里。 Straightway, the stage would set up in front of Mr Brass’s house; the single gentleman would establish himself at the first-floor window.舞台马上在布拉斯先生门前搭起;独身绅士坐在二楼窗口。 I took the elevator to the first floor and as I stood by the door, the guard there asked, "Was the old lady able to help you"乘电梯下到一楼，当我站到门口时，那门卫问:"老人能帮助你吗？"