When a thread is blocked waiting for I/O, it is useful to be able to separate the waiting thread from the original thread of execution, allowing it to continue working.
当一个线程在等待I/O 的过程中被阻止时，将等待中的线程与原始执行线程分离开来将会很有用，这将使它能继续工作。
If a timer is blocked from immediately executing it will be delayed until the next possible point of execution (which will be longer than the desired delay).
如果一个timer在将要执行的时候被阻塞，它将会等待下一个时机(比预期的延时要长)。
If a timer is blocked from immediately executing it will be delayed until the next possible point of execution (which will be longer than the desired delay).
如果一个timer在将要执行的时候被阻塞，它将会等待下一个时机(比预期的延时要长)。
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