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
, ]: {8 J& `7 w" v# D+ ^3 v1 Q) d; S    ask patch 0 0 [
8 R, m: n( n7 Q5 m& W      create-initial-turtles num-random-min   "random-min"   violet
      create-initial-turtles num-random       "random"       brown
6 F7 ?7 e9 D- p' D+ f8 l8 U      create-initial-turtles num-random-away  "random-away"  pink
      create-initial-turtles num-open-min     "open-min"     blue
      create-initial-turtles num-open-min-max "open-min-max" orange ]
  set-common-variables
  l) Q  C9 k0 c/ Bend
2 T& H  g$ g* @
9 Z0 y( v, b( e% i9 x. b( X6 ^) ?% lto create-initial-turtles [n turtle-rule turtle-color]
  ask n-of n (patches in-radius initial-radius with [not any? turtles-here])
; ?- W8 _  W, t  [ sprout 1
    [ set rule turtle-rule
      set color turtle-color ] ]
end

6 r& U1 G' J! K2 T[ 本帖最后由 etamina 于 2008-4-30 13:05 编辑 ]