一种内部存储区，专门用来保存中间结果和各种标记，也可用作工作区，这是一种可以迅速擦除的主存储区。
A unique internal storage area, reserved for intermediate results, various notations, or working area. It is a quickly erasable main storage.
存储器诊断单元使第二处理器执行存储器诊断程序来对主存储器进行诊断，并识别主存储器中的缺陷区。
The memory-diagnostic unit causes the second processor to execute a memory-diagnostic program to diagnose the main memory, and identifies a defective area in the main memory.
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