您需要在此处运行两个查询

第一个查询我们将返回所有顶级页面Asia, Africa 和America 是顶级页面

第二次查询我们将返回顶级页面的所有直接子级

您可以尝试以下方法：

$parent_id_args = [
    \'post_parent\'    => 0, // Get all top level pages
    \'post_type\'      => \'page\', // Change if this is a hierarchical custom post type
    \'posts_per_page\' => -1, // Get all pages
    \'fields\'         => \'ids\', // Only get ID\'s
    // Add any additional parameters
];
$parent_ids = get_posts( $parent_id_args );

//Make sure we have pages
if ( $parent_ids ) {
    $args = [
        \'post_type\'       => \'page\', // Change according to correct post type
        \'posts_per_page\'  => -1,
        \'post_parent__in\' => $parent_ids, // Get child pages from these parent
        // Any additional arguments
    ];
    $q = get_posts( $args );
    if ( $q ) {
        foreach ( $q as $post ) {
            setup_postdata( $post );

            the_title();

        }
        wp_reset_postdata();
    }
}