Auxiliary storage, also called Secondary storage, stores instruction and data when they are not being used by the processor unit.
辅助存储单元也称为第二存储单元，用来存储处理器单元当前没有使用的指令和数据。
An auxiliary power unit (APU) is used to charge the first battery to maintain a desired voltage across the first energy storage unit.
以及辅助动力单元，其可操作以给所述第一能量存储单元充电。
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