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
3 R5 ~, O, o/ P$ m, T6 I0 @      create-initial-turtles num-random       "random"       brown
      create-initial-turtles num-random-away  "random-away"  pink
' m" z' L. }8 e      create-initial-turtles num-open-min     "open-min"     blue
1 X4 f' t: T5 }9 `      create-initial-turtles num-open-min-max "open-min-max" orange ]
4 J0 b* E3 \' }( S: \7 z  set-common-variables
end

to create-initial-turtles [n turtle-rule turtle-color]
) e  A9 m( `& X" q' F  ask n-of n (patches in-radius initial-radius with [not any? turtles-here])
  [ sprout 1
    [ set rule turtle-rule
      set color turtle-color ] ]
/ ]* R" S) w$ S0 jend
, o- I  Q2 ^4 j1 M  ~
3 x0 F/ q, q, w" e% `[ 本帖最后由 etamina 于 2008-4-30 13:05 编辑 ]