语法看不懂，能帮忙解释一下吗？

etamina

下面的语句中ask patch和create-initial-turtles 后面接的[ ]中的语句是什么含义，其中非原语的都是定义的全局或者外部变量。语法有点奇怪，谁能帮我解释一下吗？多谢
to make-turtles
    ask patch 0 0 [
      create-initial-turtles num-random-min   "random-min"   violet
      create-initial-turtles num-random       "random"       brown
  P3 r& _% }+ c; J9 K8 z& J      create-initial-turtles num-random-away  "random-away"  pink
      create-initial-turtles num-open-min     "open-min"     blue
: n$ P% p4 d/ j7 W      create-initial-turtles num-open-min-max "open-min-max" orange ]
" ^; P7 j' v( t  set-common-variables
end

to create-initial-turtles [n turtle-rule turtle-color]
# {- z. Y: \( i' w2 L! L, _  ask n-of n (patches in-radius initial-radius with [not any? turtles-here])
  [ sprout 1
    [ set rule turtle-rule
      set color turtle-color ] ]
0 C! G& X  N* u) j; uend
; k6 z( n- E7 x
[ 本帖最后由 etamina 于 2008-4-30 13:05 编辑 ]