通过把原始系统当成 Facade 类的私有成员变量 (private member) 来处理，我们可以很轻易的切换我们所使用的系统。当然，也许仍然有巨大的工作量，但是至少，我只需要改变一个地方 (Facade 类 )...
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private member of base 基类的私用成员
N a member of a legislative assembly, such as the House of Commons, not having an appointment in the government 无行政职务的议员
The MP (private member) moved an amendment to the Bill.
那位下院议员提议修订该法案。
The Book class is then defined, with private member variables for each field.
然后定义book类，用私有成员变量代表每个字段。
That is, in C++, objects of the same class cannot see one another's private member variables.
也就是说，在 C++ 中，同一个类的对象无法看到彼此的私有成员变量。
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