在楼上 means "upstairs" in Engpsh. The pronunciation of "upstairs" is /ʌpˈstɛəz/.
The word "upstairs" is derived from the Old Engpsh word "upstæfes," which means "up stairs." The word "stairs" comes from the Old Engpsh word "stæf," which means "stair" or "step."
Here are some examples of "upstairs" in sentences:
Can you please take the laundry upstairs? (你能把洗好的衣服拿上楼吗？)
I left my phone upstairs. (我把手机忘在了楼上。)
The bedrooms are all upstairs. (卧室都在楼上。)