/// <summary>
        /// 准备没有蔬菜的膳食
        /// </summary>
        /// <returns></returns>
        public Meal_膳食 PrepareNonVegMeal()
        {
            Meal_膳食 meal = new Meal_膳食();

            meal.AddItem(new Foods_食物.ChickenBurger_鸡肉汉堡());
            meal.AddItem(new Foods_食物.Pepsi_百事可乐());
            return(meal);
        }
        /// <summary>
        /// 准备有蔬菜的膳食
        /// </summary>
        /// <returns></returns>
        public Meal_膳食 PrepareVegMeal()
        {
            Meal_膳食 meal = new Meal_膳食();

            meal.AddItem(new Foods_食物.VegBurger_蔬菜汉堡());
            meal.AddItem(new Foods_食物.Coke_可口可乐());
            return(meal);
        }