The terrace is higher than the interior, ok?

Feng shui is to tell science to people who don't understand science with the theory of ghosts and gods!

So:

I tell you from the perspective of geomantic omen: the terrace is the courtyard, and the courtyard is higher than the house. Evil spirits are easy to enter, which is costly and harmful.

Tell you from a scientific point of view: if the water from the terrace may flow backwards into the room and soak the floor or furniture, you will have to spend money to buy a new one; There is water on the floor. If you are not careful, you will slip.