由于MAC服务在一台终端工作站内以抽象接口的方式提供，因此它不可能指定合适的总数据包传输延时。
Since the MAC Service is provided at an abstract interface within an end station, it is not possible to specify the total frame transit delay precisely.
而虚拟搜索代理则可以使用Web服务器和HTTP接口来感知环境(Internet)并对环境进行操作，并使用一个终端作为效应器来与用户进行通信。
A virtual search agent could use Web servers and HTTP interfaces to both perceive and manipulate the environment (the Internet) and a console as an effector to communicate with a user.
未来的终端用户可能配备若干个不同的网络接口，可以在适当的时候接入当前最佳的无线网络获得最优的服务质量。
The future terminal can be equipped with several different wireless interfaces, so that they are capable of accessing information from different access points at anytime and anywhere.
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