nabho-guṇa-viśeṣo 'rtho
yasya tac chrotram ucyate
vÄyor guṇa-viÅ›eá¹£o 'rtho
yasya tat sparśanaṠviduḥ
nabhaḥ-guṇa-viÅ›eá¹£aḥ - the distinctive characteristic of sky (sound); arthaḥ - object of perception; yasya - whose; tat - that; Å›rotram - the auditory sense; ucyate - is called; vÄyoḥ guṇa-viÅ›eá¹£aḥ - the distinctive characteristic of air (touch); arthaḥ - object of perception; yasya - whose; tat - that; sparÅ›anam - the tactile sense; viduḥ - they know.
Sound is one of the qualifications of the sky and is the subject matter for hearing. Similarly, touch is the qualification of the air and is the subject of the touch sensation.