怎样解释这个二维数组

 [

    ['小A','女',21,'大一'],

['小B','男',23,'大三'],

['小C','男',24,'大四'],

['小C','男',24,'大四'],

['小D','女',21,'大一'],

['小E','女',22,'大四'],

['小F','男',21,'大一'],

['小G','女',22,'大二'],

['小H','女',20,'大三'],

['小I','女',20,'大一'],

['小J','男',20,'大三']

];