$list=array('Andaman and Nicobar'=>array( 'North and Middle Andaman', 'South Andaman', 'Nicobar' ), 'Andhra Pradesh' => array( 'Adilabad', 'Anantapur',));
以...的形式
[['North and Middle Andaman', 'South Andaman', 'Nicobar'],['Adilabad', 'Anantapur']]