如果应用程序创建一个线程池，而线程池创建线程，线程是程序可以退出之前必须被释放的资源。
If an application creates a thread pool and the thread pool creates threads, the threads are resources that must be released (allowed to terminate) before the program can exit.
之后，尽管很多人被释放，但他们都必须宣誓放弃其信仰。
Most have since been freed, but only after renouncing their creed.
计算资源太少，来自用户的请求必须等待资源释放或拒绝那些请求直到更多的硬件被添加到环境中。
With too few computing resources, requests from users must wait for resources to free up or those requests will be rejected until more hardware is added to the environment.
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