问如何从数据中以“时间”作为keyError来解决这个Pyart问题？

EN

          KeyError                                  Traceback (most recent call last)
           <ipython-input-17-e0d335b3929e> in <module>()
            1 numfile = 0
            2 filename = os.path.join(data_dir, Directory[0])
---->       3 radar = pyart.io.read(filename)
            4 display = pyart.graph.RadarMapDisplay(radar)

       1 frames
      /usr/local/lib/python3.7/dist-packages/pyart/io/cfradial.py in read_cfradial(filename, 
      field_names, additional_metadata, file_field_names, exclude_fields, include_fields, 
       delay_field_loading, **kwargs)
    
            134     # 4.4 coordinate variables -> create attribute dictionaries enter code here
            135     time = _ncvar_to_dict(ncvars['time'])
            136     _range = _ncvar_to_dict(ncvars['range'])
            137 

          KeyError: 'time'