关闭电源后，残留在印表机内的列印资料或暂存在机器记忆体的列印资料将被清除。
Switching power off will erase print data remaining in the printer or print information spooled in its memory.
当使用者将新资料列捲动到检视内时，程式码会从快取要求新资料，并且选择性地清除记忆体的旧资料。
When the user scrolls new rows into view, your code requests new data from the cache and optionally flushes old data from memory.
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