分阶段计算中间结果，减少临时结果存储，可减小存储器需求和存储器访问次数。
Memory needs and memory access times are reduced by computing intermediate results by stages and decreasing temporary results storage.
替换函数驻留在内核句柄可访问的 存储器空间中。
The replacement function resides in a memory space that is accessible to the kernel handler.
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