Avoid explicitly setting thread priority to control execution. You can set thread
priority based on task semantic, such as below normal
(ThreadPriority.BelowNormal) for a screen saver.

避免显式地设置线程优先级来控制执行. 你可以基于任务的语义来设置线程优先级, 比如把屏幕保护线程设置成比普通的滴 (ThreadPriority.BelowNormal)