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When using thinkphp5, on the same page

namespace app\index\model;
    use think\Model;
    // 此處$target='admins';$behaviour='nihao';
    class Firstrow{
        public function mainChoose($target,$behaviour){
            $tableName = $target.'model';
            $openGate = new $tableName();
            return $result = $openGate -> $behaviour();
        }
    }

    class adminsmodel extends Model{
        protected $table = 'admins';
        public function nihao(){
            $result = $this->select()->collection()->toArray();
            return $result;
        }
    }

But the system keeps prompting that the adminsmodel class cannot be found
I suspected that it was a namespace problem, but there was no solution for a while. Could you please answer my questions