'学习内容', 'title' => '题目内容', 'type' => '题目类型', 'type_single' => '单选题', 'type_multiple' => '多选题', 'answer' => '答案选项', 'answer_content' => '答案内容', 'answer_result' => '是否正确', // 消息 'created_successfully' => '学习题目创建成功', 'updated_successfully' => '学习题目更新成功', 'deleted_successfully' => '学习题目删除成功', 'not_found' => '学习题目不存在', 'batch_created_successfully' => '批量创建题目成功', // 验证消息 'no_correct_answer' => '必须至少有一个正确答案', 'single_choice_multiple_correct' => '单选题只能有一个正确答案', 'multiple_choice_no_correct' => '多选题必须至少有一个正确答案', ];