UDP programs cannot rely on the reliability of the network; packets may be lost or reordered, and it's up to the application to handle these situations.
UDP程序不能依靠网络的可靠性；分组可能丢失或重新排序，它依靠应用程序处理这些情况。
Application layer: The application layer is used by most programs that require network communication.
应用层：这里主要是需要进行网络通信的应用程序。
Zero-copy versions of network protocol stacks greatly increase the performance of certain application programs and more efficiently utilize system resources.
在网络协议栈中实现的零-拷贝技术版本极大程度上提高了某些应用系统的性能的同时，也使它们更加充分的利用系统资源。
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