แสดงชื่อภูมิภาคที่มีพายุอย่างน้อย 2 ลูก
Show the region name with at least two storms.
df_region = pd.DataFrame(columns=['region_name', 'region_id'])
df_affected_region = pd.DataFrame(columns=['region_id'])
df_region[df_region['region_id'].isin(df_affected_region['region_id'].value_counts()[df_affected_region['region_id'].value_counts() >= 2].index)]['region_name']