Lens 2: Uncle and aunt are not sensitive to the surrounding environment. Uncle also eats food and throws garbage.

Lens 3: There are high-altitude parabolic objects on passers-by umbrellas and tools to prevent sewage under their feet.

(2) There are three main reasons: poor supervision by relevant government departments; Poor public awareness of environmental protection and health; Some citizens' civilized habits have not been developed and their awareness of environmental protection is weak.

(3) To solve the above problems, we should strengthen education from two aspects: First, strengthen the legal education of citizens. The relevant departments of the state should strengthen publicity and education on law popularization and enhance citizens' legal concept. Every citizen should enhance his awareness of abiding by the law, and refrain from spitting, littering, posting advertisements, wearing clothes and leaving them in disorder, consciously safeguard the safety and hygiene of public places and fulfill his obligation to protect the environment. The second is to strengthen citizens' ideological and moral education. Relevant government departments and social organizations should strengthen the construction of socialist spiritual civilization, advanced culture and the education of citizens' basic moral norms, actively create a good atmosphere of moral public opinion and improve the quality of citizens. Every citizen should strengthen moral cultivation, form civilized habits, and consciously abide by civilized regulations such as environmental sanitation in public places. In addition, the government and its relevant departments and social organizations should strengthen the supervision of environmental sanitation in public places.