并行执行阶段所提供的预设排程器，可让您无须管理基础结构细节。
The Concurrency Runtime provides a default scheduler so that you do not have to manage infrastructure details.
这些文件的内容无须解释，它们只用于实现彩虹的淡化部分并管理一些变量，从而确保正确地绘制新的彩虹段。
The contents of these files are self-explanatory, and simply serve to animate the fade-out portion of the rainbow and manage the variables to make sure new components are drawn correctly.
这会增加委托调用的开销，但是使您无须手动管理该池。
This adds the overhead of a delegate invocation, but relieves you from having to manage the pool manually.
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