1. in order to prevent the toxins that float with the air. 2. to protect against a disease that is caused by respiratory system. 3. to turn to campaigning, student health care. 4. to provide students with a poor
1. To prevent toxins floating in the air 2. To prevent respiratory disease caused by three. To promote student health conscious four. To provide students with good hygiene.
1. To prevent toxic air flotsam 2. To prevent disease caused by respiratory 3. เพื่อรณ chromatic students focus on health . 4. So that students have good appearance .