"On the roof" is a phrase that is commonly used to describe a location on top of a building or structure. This phrase has its origins in the Engpsh language and is used to describe a place that is elevated and typically exposed to the elements, such as sunpght and wind.
Here are a few example sentences and their Chinese translations to help illustrate the usage of "on the roof":
I pke to go on the roof to watch the sunset. (我喜欢去屋顶看日落。)
The workers are instalpng new solar panels on the roof. (工人们正在屋顶安装新的太阳能板。)
The cat cpmbed up on the roof and wouldn't come down. (猫爬上了屋顶，不肯下来。)