Laravel合并两个查询结果

$result= A − > m e r g e ( A->merge( A−>merge(B);

$noticeList = Notice::orderBy('top', 'desc')
    ->orderBy('created_at', 'desc')
    ->limit(2)->get();  //查询结果一号
$newsList = News::orderBy('top', 'desc')
    ->orderBy('created_at', 'desc')
    ->limit(2)->get(); //查询结果二号
$merge = $noticeList->merge($newsList); #重点 不能array_merge