There are three reasons why the roof tile of the house is uneven: ① The house has not been repaired-the roof tile is an important part of the house, so we should pay attention to it at any time. If it is loose, it should be repaired immediately.
(2) The population density has increased by more than 500 people per hectare (100 square meter) on average.
(3) The residents' hard-working consciousness has declined.
The roof is used to keep out the wind and rain. As always, it occupies an extremely important position at home, and we should pay attention to it at ordinary times.