yuanshan/application/admin/lang/zh-cn/classes.php

<?php

return [
    'Id'                => 'ID',
    'School_id'         => '学校ID',
    'Grade_id'          => '年级ID',
    'Classname'         => '班级名',
    'Weigh'             => '排序',
    'School.schoolname' => '学校名',
    'Grade.gradename'   => '年级名'
];