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
9 z( e$ q! V! x+ u7 ?' ?# L/ Z" Z    ask patch 0 0 [
: ^0 t, K6 K% c* z5 [( J4 @5 h      create-initial-turtles num-random-min   "random-min"   violet
6 ^, [0 @" _$ p( b1 M      create-initial-turtles num-random       "random"       brown
      create-initial-turtles num-random-away  "random-away"  pink
% u/ `; U$ ?8 K3 ^) E* j; Z$ t      create-initial-turtles num-open-min     "open-min"     blue
      create-initial-turtles num-open-min-max "open-min-max" orange ]
3 W5 }0 r. x8 `# B2 k( z& M  set-common-variables
end
+ v% T( X1 W& ~" e2 W
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
+ o$ h* W) l4 J! V0 U) v- x# E& X    [ set rule turtle-rule
& h0 e) a3 O7 V% j( {  w      set color turtle-color ] ]
/ Y* r8 f0 D: C8 jend
* k3 k' o6 O  L. A  R
9 u/ X% E, v' R9 _[ 本帖最后由 etamina 于 2008-4-30 13:05 编辑 ]