C#多层继承与Virtual关键字

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using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Player : MonoBehaviour
{
KillerApprentice killer = new KillerApprentice("Carol");
Apprentice[] many = new Apprentice[3];
public void Start()
{
many[0] = new TohouApprentice("Magic Spark");
many[0].TellName();
killer.TellName();
}
}
class Apprentice
{
public string name;
public virtual void TellName() { Debug.Log("I am " + name); }
}
class MagicApprentice : Apprentice
{

}
class KillerApprentice : Apprentice
{
public KillerApprentice(string name)
{
this.name = name;
}
public override void TellName()
{
Debug.Log("Just call me " + name);
}
}
class TohouApprentice : MagicApprentice
{
public TohouApprentice(string name)
{
this.name = name;
}
public override void TellName()
{
base.TellName();
Debug.Log("I need some mushrooms");
}
}