Keywords
35 to 39 years, 40 to 49 years, 45 to 49 years, 50 to 54 years, 50 to 59 years, adult, adult education, blur, caucasian, class, classroom, college, day, differential focus, diversity, educate, educating, education, ethnic, facial expression, female, five people, focus, focus techniques, group, group of people, head and shoulders, headshot, indoors, learning, lecture, male, man, mature adult, mature man, mature student, mature woman, mid adult, mid adult woman, mix, mixed, mixed race, multi ethnic, multi-ethnic, multi-ethnic group, public services, school, sitting, small group of people, smiling, social institution, student, university, white, woman, stock image, images, royalty free photo, stock photos, stock photograph, stock photographs, picture, pictures, graphic, graphics, fine art prints, print, poster, posters, mural, wall murals, is099qs9y