“楼上”的英语表达是 upstairs。例如：

1. 我住在三楼，楼上就是四楼。[I live on the third floor, and the floor above is the fourth floor.]

2. 楼上有人在吵架。[There's a fight going on upstairs.]

3. 楼上有一个公共露台，可以看到整个城市的美景。[There's a public terrace upstairs，可以看到整个城市的美景.]

4. 他正在楼上厅里等候。[He is waiting in the upstairs hall.]

5. 寝室在楼上，餐厅在楼下。[The bedrooms are upstairs and the dining-room is downstairs.]

6. 听见楼上传来沙哑的声音。[I heard sounds of raucous laughter upstairs.]

7. 我想它应该在楼上的阁楼里。[I expect it'll be in the attic upstairs.]