获取指向用于读写内存中的元数据的内部接口实例的指针。
Gets a pointer to an internal interface instance used to read and write metadata in memory.
为了简单起见，执行器代表了世界上所有能够直接跟内存交互(即他们可以直接读写内存)的机器和人。
The actuator stands for all the machines and human beings in the world that, for the sake of simplicity, can interact directly with the memory, i.e. : they can read from and write to memory.
背景灯、读写内存、无线连接、特殊的硬件和处理器速度，所有这些会对总体功耗产生重要的影响。
Backlighting, reading and writing to memory, wireless connections, specialized hardware, and processor speed all have an impact on the overall power usage.
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