该处理器的工作就是检索指令和操作数从记忆并执行每个操作。
The processor's job is to retrieve instructions and operands from memory and to perform. each operation.
它按主存储器里固定的步骤选择和检索指令，以便在适当的时刻激活系统的其它功能组件来执行相应的操作。
It selects instructions from the main memory in proper sequence and sends them to the instruction-decoding unit, which interprets them so as to activate functions of the system at appropriate moments.
TS(跟踪选择，Trace Selection)，每当样式表伪指令执行select操作以从源文档检索数据时就生成一条消息。
TS (Trace Selections) produces a message each time a stylesheet directive performs a select operation to retrieve data from the source document.
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