Or, if you want to paint, you can paint it blue throughout because every roof which you see in this picture collects rainwater drops and deposit in the rooms.
或许，如果你想作画，你可以把这里画成蓝色， 因为在这张图片里你看到的每一个屋顶 都是用来收集雨水的， 并把这些雨水引入屋里储存起来。