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
& f) U6 _% J% ^9 M    ask patch 0 0 [
      create-initial-turtles num-random-min   "random-min"   violet
* n  `+ N3 F1 v0 A# v9 q' d) C      create-initial-turtles num-random       "random"       brown
9 K" Y- z/ t% Y# k/ U' v7 G      create-initial-turtles num-random-away  "random-away"  pink
& X" M+ A, P9 g7 v1 _      create-initial-turtles num-open-min     "open-min"     blue
      create-initial-turtles num-open-min-max "open-min-max" orange ]
( v% g9 N$ d% B6 T+ M+ z  set-common-variables
) [5 ~2 N7 _. w2 h. {% s; N) x. ^end
' V+ @# Y) g: W+ P; R
to create-initial-turtles [n turtle-rule turtle-color]
  ask n-of n (patches in-radius initial-radius with [not any? turtles-here])
  [ sprout 1
    [ set rule turtle-rule
# `( p' @$ g$ w. i: T) X      set color turtle-color ] ]
: ]( V( P+ C2 y3 u5 j& W2 H3 z, Aend

[ 本帖最后由 etamina 于 2008-4-30 13:05 编辑 ]