n.操作数，运算数
An operator or operand in a computer instruction.
计算机指令中的操作符或操作数.
Complement, Shift, and Rotate operations require one operand.
“求补”, “移位”和“环移”等操作就只需要一个操作数.
Bring the first operand to the date register.
将第一个操作数输入数据寄存器.
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