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 [
      create-initial-turtles num-random-min   "random-min"   violet
! I' K' J7 n- b3 V& h' Z      create-initial-turtles num-random       "random"       brown
! Y, G7 @; c" c( s      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 ]
  set-common-variables
$ ]- w3 h$ }& Q0 e" Z+ q* T' Wend
  n, J- u7 w* t, @0 O: n
to create-initial-turtles [n turtle-rule turtle-color]
% I2 j( h& J: u$ X( F  |7 u5 x9 A  ask n-of n (patches in-radius initial-radius with [not any? turtles-here])
  [ sprout 1
7 d% e9 _, m- @1 @" N6 P$ K0 p    [ set rule turtle-rule
      set color turtle-color ] ]
% k2 L3 {7 O8 i; j% y, A2 q' e+ R8 A6 cend
. V- {  P  h7 b' G* p: m
[ 本帖最后由 etamina 于 2008-4-30 13:05 编辑 ]