在任何时候，在 Python 程序需要这些对象时，变量只能相应地引用其中一个值。
Anytime these objects are needed in a Python program, the variable just references one as appropriate.
因为我们显式地将新变量拼接到现有的语法对象中，所以不会对它们进行重命名。
Since we explicitly spliced the new variables into the existing syntax object, there is no chance for them to be renamed.
对象最终存储在内存中，但编译器、运行库、处理器或缓存可以有特权定时地在变量的指定内存位置存入或取出变量值。
Objects are ultimately stored in memory, but the compiler, runtime, processor, or cache may take some liberties with the timing of moving values to or from a variable's assigned memory location.
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