在进 程启动的同时即同时为它启动了一个线程，该线程称作主线程或基本线程（primary thread）或执行线程 （thread of execution），此主线程负责执行在进程地址空间内的代码。此外，这个主线程也可继续创建子 线程。
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Each process starts with a single thread, which is known as the primary thread.
每个进程启动时都具有一个线程，该线程称为主线程。
However, auxiliary threads can be created and used to execute code in parallel with the primary thread.
不过，可以创建辅助线程，以便与主线程一起并行执行代码。
When you start Notepad, the operating system creates a process and begins executing the primary thread of that process.
当您启动记事本时，作业系统会建立处理序并且开始执行该处理序的主执行绪。
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