控制显示单元的发光，以便其闪烁，闪烁次数对应于每单位时间的帧数量。
Emission of light of the display cell is controlled so that it blinks by a number of times per unit time corresponding to the number of frames per unit time.
在对有大量内存的系统进行扫描时，因为页面置换算法始终寻找空闲帧，所以需要扫描的页帧数量非常大。
Because the page replacement algorithm is always looking for free frames while it is doing its scanning on systems with a lot of memory, the number of frames to scan can be significant.
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