Keywords
25-29 years, 30-34 years, adults only, analysing, bottle, caucasian appearance, chemical, chemical analysis, chemical analysis laboratory, chemistry, chinese ethnicity, container, dewar flask, engineer, engineering, engineering school, engineering student, examining, experiment, female, flask, forceps, front view, happiness, holding, indoors, lab, lab coat, laboratory, laboratory equipment, learning, liquid, liquid nitrogen, looking down, machine, men, mid adult, mid adult men, person in education, protection, protective eyewear, protective glove, protective workwear, research, safety, scientific experiment, smiling, stem education, student, studying, teamwork, technology, two people, ultra purification, ultrafiltration, ultrafiltration system, university, university student, waist-up, water purification, water purification system, water ultrapurification, woman, women, young adult, young women, 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, u59890057