Why not allow anyone to enter the laboratory?

This is a very important place. The main reason why no one is allowed to enter the laboratory is that it is a very important place. If others enter at will, it will easily lead to problems in the experimental results, accidents and serious losses, so they will put up signs to warn others not to enter. The safety warning signs that prohibit pedestrians from entering the laboratory in the laboratory are eye-catching in safety and title. After seeing such safety warning signs, people consciously stay away from the experimental site to avoid accidents.