小白 求大神帮忙每行注释下，谢谢了

上官女00

begin

  yrStrt = 1980

  yrLast = 2011

  season = "JFM"    ; choose Dec-Jan-Feb seasonal mean

  f      = addfile ("/disk_raid5/data/NCEP2-2.5/monthly/pressure/uwnd.mon.mean.nc", "r")

  TIME   = f->time

  YYYY   = cd_calendar(TIME,-1)/100                 ; entire file

  iYYYY  = ind(YYYY.ge.yrStrt .and. YYYY.le.yrLast)

  uwnd   = short2flt(f->uwnd(11:394,7,0:36,:))           ;

  UWND         = month_to_season (uwnd, season)

  nyrs        = dimsizes(UWND&time)

  time  = TIME(11:394)

  lat=f->lat(0:36)

  lon   = f->lon

  level = f->level

; calculate climatology  

  UWND_cli = dim_avg_n_Wrap(UWND, 0)

ff      = addfile ("/disk_raid5/data/NCEP2-2.5/monthly/pressure/vwnd.mon.mean.nc", "r")

TIME2   = ff->time

YYYY2   = cd_calendar(TIME2,-1)/100                 ; entire file

iYYYY2  = ind(YYYY2.ge.yrStrt .and. YYYY2.le.yrLast)

vwnd   = short2flt(ff->vwnd(11:394,7,0:36,:))           ;VWND         = month_to_season (vwnd, season)

VWND         = month_to_season (vwnd, season)

nyrs        = dimsizes(VWND&time)

time  = TIME(11:394)

lat=ff->lat(0:36)

lon   = ff->lon

level = ff->level

; calculate climatology

VWND_cli = dim_avg_n_Wrap(VWND, 0)

wks = gsn_open_wks("ps","UV300")

gsn_define_colormap(wks,"temp_diff_18lev")       ; choose colormap