protocol of application layer的用法和样例：
例句
- The purpose of this layer is to define the application layer protocol for the exchange of cellular subscriber information between networks.
这一层的主要用途是为了定义在网络间交换蜂窝网络用户信息的应用层协议。 - Select the transport layer you want for interrogating your nameservers.
选择你要查询你的服务器的传输层协议。
