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
( o3 b4 S3 G3 _% b# W! Cto make-turtles
    ask patch 0 0 [
      create-initial-turtles num-random-min   "random-min"   violet
9 E9 ~- q7 w! r$ N9 w, m      create-initial-turtles num-random       "random"       brown
      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
& J# ^  T: s  J1 }/ u; K+ X* Zend

( {# D4 n1 ^# fto create-initial-turtles [n turtle-rule turtle-color]
; O% y/ l9 Y2 h) B& U% I  ask n-of n (patches in-radius initial-radius with [not any? turtles-here])
  [ sprout 1
    [ set rule turtle-rule
% G1 q" F) {& |      set color turtle-color ] ]
end

6 Q5 J  X4 c7 S- }$ N- m% t[ 本帖最后由 etamina 于 2008-4-30 13:05 编辑 ]