1. For data transfer to begin, the source and destination applications inform the operating systems that a connection will be initiated. 当资料传送要开始时，来源和目的地的应用程式通知作业系统，有一个连接将开始。
2. Without the operating system, none of the application programs on your computer system can run; in fact, the computer would not function. 如果没有操作系统，计算机环境里的任何应用程序都不能运行；事实上，计算机将失去作用。
3. Friends in the door, to introduce a motor vehicle standards, including operating systems, communication systems, network management, etc. 朋友门，给大家介绍一个汽车的标准，包括操作系统，通信系统，网络管理等。
英英解释
adj.
1. involved in a kind of operation
2. being in effect or operation
