Ключевые слова: adolescent, break, building, campus, classmate, college, communicate, construction, daytime, diverse, education, friend, gather, group, horizontal, hug, library, lunch, meeting, modern, multiethnic, multiracial, outdoors, public, rest, school, share, smartphone, speak, stair, step, street, structure, student, talk, teen, teenager, together, university, urban, using, young,