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
    ask patch 0 0 [
& M0 b( t( E# Y- z5 L      create-initial-turtles num-random-min   "random-min"   violet
+ X( R- B  I7 l$ X5 H- Z      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 ]
+ i$ V; J# F% H1 @  set-common-variables
end

+ a, R8 p) ?1 w3 Uto create-initial-turtles [n turtle-rule turtle-color]
  ask n-of n (patches in-radius initial-radius with [not any? turtles-here])
4 b' ]/ X+ Z) t/ E) ~" N0 Y0 I/ u  [ sprout 1
  e* {, a- l, F* N' a6 @' ~    [ set rule turtle-rule
) m5 b- g; j- d3 ~      set color turtle-color ] ]
end

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