Ключевые слова: absence, airplane, background, blue, colorful, danger, earplug, earplugs, equipment, filter, foam, green, health, healthcare, industrial, isolated, noise, object, personal, plane, plug, prevention, protection, protective, quiet, reduce, reduction, regulation, rest, safe, safeguard, safety, silence, silent, sleep, soft, sound, square, stop, tools, travel, violet, white,