伪静态规则有一点看不懂，求大牛稍作解析~

RewriteEngine On
RewriteRule ^(.*)/index.html$ $1/index.php
RewriteRule ^(.*)/(\w+).html$ $1/index.php?do=$2
RewriteRule ^(.*)/(\w+)-(\w+).html(.*) $1/index.php?$4&$2=$3 [QSA,L,NC]
RewriteRule ^(.*)/(\w+)-(\w+)-(\w+).html$ $1/index.php?do=$2&$3=$4
RewriteRule ^(.*)/(\w+)-(\w+)-(\w+)-(\w+).html(.*) $1/index.php?$6&$2=$3&$4=$5 [QSA,L,NC]
RewriteRule ^(.*)/(\w+)-(\w+)-(\w+)-(\w+)-(\w+).html$ $1/index.php?do=$2&$3=$4&$5=$6
RewriteRule ^(.*)/(\w+)-(\w+)-(\w+)-(\w+)-(\w+)-(\w+).html(.*) $1/index.php?$8&$2=$3&$4=$5&$6=$7 [QSA,L,NC]
RewriteRule ^(.*)/(\w+)-(\w+)-(\w+)-(\w+)-(\w+)-(\w+)-(\w+).html$ $1/index.php?do=$2&$3=$4&$5=$6&$7=$8

RewriteRule ^(.*)/(\w+)-(\w+)-(\w+)-(\w+)-(\w+)-(\w+)-(\w+)-(.*) $1/$9?do=$2&$3=$4&$5=$6&$7=$8 [C,NC]
RewriteRule ^(.*)/(\w+)-(\w+)-(\w+)-(\w+)-(\w+)-(\w+)-(\w+).html(.*)  $1/$8.html$9&$2=$3&$4=$5&$6=$7 [C,NC]
RewriteRule ^(.*)/(\w+)-(\w+)-(\w+)-(\w+)-(\w+)-(\w+)-(\w+).html(.*)  $1/$8.html$9&$2=$3&$4=$5&$6=$7 [C,NC]
RewriteRule ^(.*)/(\w+)-(\w+)-(\w+)-(\w+)-(\w+)-(\w+)-(\w+).html(.*)  $1/$8.html$9&$2=$3&$4=$5&$6=$7 [C,NC]
RewriteRule ^(.*)/.html(.*) $1/index.php$2 [QSA,L,NC]

apache伪静态，后面的能理解，红色的三行有点绕不过弯，向各位大牛求解释！！最后一段是超过9个参数以后用的，这个能说得通，那上面三句，没想通~