As a consequence, the instruction set contains mostly arithmetic and branch operations but none that resemble kernel mode instructions of the PPE.
结果是指令集中包含大部分算术操作和转移操作，但是并不包含PPE中的那种内核模式指令。
2
In a computer, a functional unit that interprets and executes instructions. Note: a processor consists of at least an instruction control unit and an arithmetic and logic unit.
计算机中，解释并执行指令的一种功能单元。注：处理器至少包含有一个指令控制器和一个算术与逻辑运算器。
3
The part of execution in which an operand or instruction is read from main storage and written into a control unit or arithmetic unit register.