普通线程的创建，通过 委托ThreadStart对应的函数来执行相关操作；

通过线程池，可以直接从池中查找出空闲线程，让它执行委托WaitCallback对应函数来执行相关操作。使用时要与AutoResetEvent来并用，以在线程结束时通知主线程退出；-The common thread creation, commissioned by the the ThreadStart corresponding function to perform the related operations　thread pool, you can find out from the pool of idle threads, let it run for commission the WaitCallback corresponding function to perform the related operations. And AutoResetEvent use and, to the end of the thread notify the main thread exits