It's on the second floor
在二楼
Billy: What grade are you in?
Sophie: I'm in the third grade.
Billy: Let me help you. Where is your classroom?
Sophie: It's on the second floor.
Billy: Whew! Here it is.
Sophie: Thank you. But...I have to take it to the science room.
Billy: What? It's on the fourth floor!
比利：你是几年级的?
苏菲：我是三年级的。
比利：让我来帮你吧。你的教室在哪里?
苏菲：在二楼。
比利：噢!终于到了。
苏菲：谢谢你。但是......我必须把它拿去实验室。
比利：什么?那是在四楼!