这让处理器可以提前准备分支操作（例如预取指令）。
This allows the processor to prepare for the branch ahead of time (prefetching the instructions, for instance).
取指令对于每个指令来说都是个普通操作，它包括从内存单元中读指令。
The instruction fetch is a common operation for each instruction , and consists of reading an instruction from a location in memory.
在单指令流单数据流结构中，有单一的指令周期，在执行前，单个处理机按序取操作数。
In an SISD architecture there is a single instruction cycle; operands are fetched serially into a single processing unit before execution.
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