It refers to the delivery of a specific drug directly to the lungs or using the lungs as a medium, where the drug is actively or passively inhaled by the patient to achieve the treatment of a localized or systemic disease. The company utilizes specific drug delivery devices to deliver drugs in aerosol form (powder mist, aerosol, inhalation mist droplets, etc.) to the lungs via the respiratory tract, and then solves the quality problem caused by the escape of metal ions from the pipeline during the manufacturing process through process improvement.