/// <summary>
/// 构造函数，传入要装饰的对象
/// </summary>
/// <param name="beverage"></param>
public Milk(Beverage.Beverage beverage)
{
this.beverage = beverage;
}
/// <summary>
/// 构造函数，传入要装饰的对象
/// </summary>
/// <param name="beverage"></param>
public Sugar(Beverage.Beverage beverage)
{
this.beverage = beverage;
}
