万能的 吧友，给我看看 这代码什么意思 ？代码不多 看看吧

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Utility
{
public class ObjectPoolUtility<T> where T : new() {
private readonly List<T> mUsed = new List<T>();
private readonly List<T> mUnused = new List<T>();
public List<T> usingObjects {
get { return mUsed; }
}
//public List<T> unusingObjects {
// get { return mUnused; }
//}
public T Spawn()
{
if (mUnused.Count > 0) {
T item = mUnused[0];
mUsed.Add(item);
mUnused.RemoveAt(0);
return item;
}
else {
T item = new T();
mUsed.Add(item);
return item;
}
}
public bool Recycle(T item)
{
if (mUsed.Remove(item))
{
}
mUnused.Add(item);
return true;
}
}
}