For example, a compiler may choose to optimize a loop index variable by storing it in a register, or the cache may delay flushing a new value of a variable to main memory until a more opportune time.

例如，编译器为了优化一个循环索引变量，可能会选择把它存储到一个寄存器中，或者缓存会延迟到一个更适合的时间，才把一个新的变量值存入主存。

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Displaying Images in a loop with time delay?

在一个时间延迟循环显示图像？

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But it is hard to realize the dual-loop instantaneous control with digital scheme, because there is delay time of sampling and computing and lack of real-time regulation for digital control.

数字控制器存在采样与计算延时，实时控制性差，采用数字控制器实现双闭环瞬时值控制比较困难。

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