对于类型转换运算符，操作数或返回类型必须是类或结构的数据类型。

For a type conversion operator, either the operand or the return type must be of the data type of the class or structure.

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执行过程中的一个阶段所需的时间，在此期间，计算机从主存储器中取出指令或操作数，并将其存入控制器或运算器的寄存器中。

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.

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