Hong kong hotel SARS

A: There is not enough water in the U-shaped trap, the liquid level at both ends is not level, and the floor drain is not isolated from the air in the underground waterway, which makes the floor drain of the family bathroom communicate with the outdoor sewer. After the air or water droplets with SARS virus enter the sewer, they enter the toilets of other households through the U-bend, thus causing the spread of SARS virus in a large area.