C# new关键字和override

using System;
class MyBaseClass
{
    virtual public void Print()
    {Console.WriteLine("This is the 鸡 class.");}
}
class MyDerivedClass:MyBaseClass
{
    override public void Print()
    {Console.WriteLine("This is the derived 派生的 class.");}
}


class SecondDerived : MyDerivedClass {
     new public void Print() {       //这里关键字是override呢？
         Console.WriteLine("This is the second derived class.");
      }
   }
  
   class Program {
      static void Main()                                    // Main
      {
         SecondDerived derived = new SecondDerived();       // Use SecondDerived.
         MyBaseClass mybc = derived;      // Use MyBaseClass.
         //也可以写成MyBaseClass mybc=(MyBaseClass)derived;
  
         derived.Print();
         mybc.Print();
      }
   }