yueke/application/admin/lang/zh-cn/lesson.php

<?php

return [
    'Id'            => 'id',
    'Name'          => '标题',
    'Image'         => '主图',
    'Price'         => '价格',
    'Oldprice'      => '原价格',
    'Content'       => '信息内容',
    'Lessoncate_id' => '课程分类id',
    'Cate.name'     => '课程分类'
];