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
' P! M4 T! L! p# lto make-turtles
% G9 Z2 @7 s# y9 \) o) }    ask patch 0 0 [
! X8 P' \5 N2 w9 [! g      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
; L; ?$ q) ~- w6 n' X3 M      create-initial-turtles num-open-min     "open-min"     blue
      create-initial-turtles num-open-min-max "open-min-max" orange ]
  set-common-variables
end
5 D4 g& _0 m$ `, U1 N) T
to create-initial-turtles [n turtle-rule turtle-color]
( l2 N: x- t" v( a2 ^  ask n-of n (patches in-radius initial-radius with [not any? turtles-here])
  [ sprout 1
    [ set rule turtle-rule
5 R/ g6 t3 q  B2 P8 }  z6 e      set color turtle-color ] ]
0 Y, U& ?0 `9 ?% H# bend
0 L5 e$ g1 F7 c6 r  k+ U: u, k
[ 本帖最后由 etamina 于 2008-4-30 13:05 编辑 ]