sentence: Irregular vibrations are noise.
sentences_before: These vibrations make air molecules move. When the vibrating air molecules reach our ears, the eardrum vibrates, too. The bones of the ear vibrate in the same way that of the object that started the sound wave. These vibrations let you hear different sounds. Even music is vibrations.
concept_name: irregular vibration
headings: Sound
categories: Basic English 850 words