The include module provides named constants for each IO operation code (i.e. QrnOperation_OPEN, QrnOperation_CHAIN, etc).
这个 include 模块为每个 IO 操作码提供一个已命名常量（即 QrnOperation_OPEN、QrnOperation_CHAIN，等等）。
What is a little more common is some kind of IO operation, like accessing a Web service, or reading from the local file system.
XUL 应用程序中较为常见的是一些 IO 类的操作，如访问 Web 服务或是从本地文件系统读取。
As mentioned earlier, one common use of multithreading is some type of IO operation, such as accessing a Web service over the Internet.
如前面所提到的，多线程的一个常见应用就是某类IO操作，例如访问Internet上的一个Web服务。
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