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
$ Y; e' V$ ]/ Z# e2 s  \1 i2 U    ask patch 0 0 [
3 o- @9 Q6 ]7 o( \      create-initial-turtles num-random-min   "random-min"   violet
      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 ]
+ ^' ~+ m8 s8 B8 p/ @+ l  set-common-variables
end

/ F& Q. z2 n$ m3 |3 Fto create-initial-turtles [n turtle-rule turtle-color]
; Z! U1 y; v; T9 j2 x7 u  ask n-of n (patches in-radius initial-radius with [not any? turtles-here])
$ t( t" i9 g* K, n  [ sprout 1
    [ set rule turtle-rule
; H( T0 A) X  |/ H* H      set color turtle-color ] ]
  Z) p. a6 i6 p- ]end
1 C5 u5 s( {0 d- n+ Z4 d& P) [% |
[ 本帖最后由 etamina 于 2008-4-30 13:05 编辑 ]