Ключевые слова: acoustic, background, bedtime, blue, booming, calm, care, color, comfort, copy, ear, earplugs, ears, equipment, foam, grunge, health, hear, hearing, inserting, irritating, listen, loud, mask, night, noise, object, plugging, plugs, problem, protection, protective, quiet, reduce, relax, rest, safe, safety, silence, sleep, sleeping, sound, space, stoppers, table, text, tool, top, view, white,