RecruitingPhase 2Drug trialA Clinical Trial to Evaluate the Efficacy and Safety of HRS-9821 Inhalation Suspension in Patients With Moderate to Severe Chronic Obstructive Pulmonary DiseaseThe study is being conducted to evaluate the efficacy and safety of HRS-9821 for patients with COPD, and to explore the reasonable dosage of HRS-9821 for patients with COPD.