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
0 r% j+ V  P: p3 J6 w# B' Y    ask patch 0 0 [
      create-initial-turtles num-random-min   "random-min"   violet
0 B9 z" u1 `* d1 Q# y      create-initial-turtles num-random       "random"       brown
( q5 s) @. _6 ~+ W  E      create-initial-turtles num-random-away  "random-away"  pink
: O! T9 k% I/ @5 c! ?      create-initial-turtles num-open-min     "open-min"     blue
      create-initial-turtles num-open-min-max "open-min-max" orange ]
: u% _* O3 u) m1 I. f+ m0 S  set-common-variables
end
, a4 r4 }( z4 m/ K+ F  E- y# V
- U* j" K0 ?% u* Z- [to create-initial-turtles [n turtle-rule turtle-color]
' s+ t, b: D- u! v) a7 v  ask n-of n (patches in-radius initial-radius with [not any? turtles-here])
  [ sprout 1
    [ set rule turtle-rule
4 t4 B$ ^* Y0 j5 J- @      set color turtle-color ] ]
* X: P- o1 v3 C; o: \& Z7 ~" `; Bend

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