线程是操作系统分配处理器时间的基本单元，并且进程中可以有多个线程同时执行代码。
Threads are the basic unit to which an operating system allocates processor time, and more than one thread can be executing code inside that process.
线程是操作系统分配处理器时间的基本单元，并且进程中可以有多个线程同时执行代码。
Threads are the basic unit to which an operating system allocates processor time, and more than one thread can be executing code inside that process.
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