Keywords
30 to 34 years, 35 to 39 years, adult, adult education, blur, cafe, cell, cells, cellular telephone, communication, consumer electronics, day, demonstration, differential focus, educate, educating, education, electronics, facial expression, female, focus, focus on foreground, focus techniques, four people, group, group of people, head and shoulders, headshot, indoors, interaction, internet, learning, male, man, mature student, mid adult, mid adult man, mid adult woman, mobile, networking, office, office interior, online, public services, shallow focus, showing, small group of people, smartphone, smiling, social institution, structures, student, technology, telephone, web, wifi, wireless internet, wireless technology, woman, work, workplace, 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, is099qt0y