China Naming Network - Company naming - Is the indoor floor lower than the outdoor floor?

Is the indoor floor lower than the outdoor floor?

Lower than outdoor, sometimes because of the space in all rooms, find the ground level.

As long as it is not too low, low 1.2 cm is normal. If it is lower than 10 cm, it will give people an uncomfortable feeling.

Is a person, from the outside into the room, the feeling of stepping into the pond, will be uncomfortable.