多个自定义帖子类型未在WordPress中注册

function custom_post_type(){
    //post type for popular sight seeing
    $labels = array(
        'name' => _x( 'popular_site_seeing', 'Post Type General Name', 'travel' ),
        'singular_name'=> _x( 'popular_site_seeing', 'Post Type Singular Name', 'travel' ),
        );
    $args = array(
        'label'               => __( 'popular_site_seeing', 'travel' ),
        'description'         => __( 'popular_site_seeing', 'travel' ),
        'labels'              => $labels,
        'supports'            => array( 'title', 'editor', 'excerpt', 'author', 'thumbnail', 'comments', 'revisions', 'custom-fields', ),

        'taxonomies'          => array( 'genres' ),
        'hierarchical'        => false,
        'public'              => true,
        'show_ui'             => true,
        'show_in_menu'        => true,
        'show_in_nav_menus'   => true,
        'show_in_admin_bar'   => true,
        'has_archive'         => true,
        'publicly_queryable'  => true,
        'capability_type'     => 'post',
        );
    // Registering popular_site_seeing
    register_post_type( 'popular_site_seeing', $args);

    //post type for popular_treking_climbing
    $labels= array(
        'name' => _x( 'popular_treking_climbing', 'Post Type General Name', 'travel' ),
        'singular_name'=> _x( 'popular_treking_climbing', 'Post Type Singular Name', 'travel' ),
        );
    $args = array(
        'label'               => __( 'popular_treking_climbing', 'travel' ),
        'description'         => __( 'popular_treking_climbing', 'travel' ),
        'labels'              => $labels,
        'supports'            => array( 'title', 'editor', 'excerpt', 'author', 'thumbnail', 'comments', 'revisions', 'custom-fields', ),

        'taxonomies'          => array( 'genres' ),
        'hierarchical'        => false,
        'public'              => true,
        'show_ui'             => true,
        'show_in_menu'        => true,
        'show_in_nav_menus'   => true,
        'show_in_admin_bar'   => true,
        'has_archive'         => true,
        'publicly_queryable'  => true,
        'capability_type'     => 'post',
        );



    //registering popular_treking_climbing
    register_post_type( 'popular_treking_climbing', $args);


}

add_action( 'init', 'custom_post_type' );

如您所见，我正在尝试在WordPress中制作两种自定义帖子类型，一种称为popular_site_seeing，另一种称为popular_treking_climbing.自定义帖子popular_site_seeing正在注册，我可以从WP管理面板访问它，但是，另一种帖子类型popular_treking_climbing未显示在WP管理面板上。 我在这里做错了什么？ 我搜索到哪里，它说我正在做的事情是正确的方式。