您如何将以下三个表与laravel中的eloquent结合起来？

namespace App;

use Illuminate\Database\Eloquent\Model;

class User extends Model
{
    protected $table = 'users';

    public function orders()
    {
        return $this->hasMany(Order::class);
    }
}

namespace App;

use Illuminate\Database\Eloquent\Model;

class Order extends Model
{
    protected $table = 'orders';

    public function user()
    {
        return $this->belongsTo(User::class);
    }

    public function products()
    {
        return $this->belongsToMany(Product::class);
    }
}

namespace App;

use Illuminate\Database\Eloquent\Model;

class Product extends Model
{
    protected $table = 'products';

    public function orders()
    {
        return $this->belongsToMany(Order::class);
    }
}

$user = User::find(1);
$orders = $user->orders;

$order = Order::find(1);
$products = $order->products;