2. Prevent strangers from chatting up;

3. Some negative things will affect students' study;

4. I am afraid of unknown origin;

5. Prevent strangers from carrying dangerous goods.

Schools for the deaf are referred to as schools for the deaf. The special education system for deaf-mute children and adolescents combines basic education with secondary professional education institutions. The earliest school for the deaf in the world was founded in Paris in 1770 by a Frenchman.