In order to illustrate these basic components, we will use a simple XML fragment from an application dealing with readings from colorimeters (devices that measure colors using tri-stimulus readings).
为了说明这些基本组件，我们将使用处理色度计(用三基色法读数测量颜色的设备)读数的应用程序中一段简单的xml片段。
There is an exception when you are dealing with a multi-thread application.
当您在处理多线程程序时，还有一个例外。
When dealing with multiple file descriptors, an application typically sets each file descriptor as non-blocking (as shown in Listing 1) and issues a read on one file descriptor at a time.
在处理多个文件描述符时，应用程序通常把每个文件描述符设置为非阻塞(见清单1)，每次对一个文件描述符执行read调用。
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