OK, so far we are pretty happy. Now let's do a change of variables.
现在还是皆大欢喜，对变量做一点变化。
Because you never change the states of your variables, proving your program is much easier.
由于从来没有改变变量的状态，所以证明您的程序非常简单。
Variables serve as placeholders for data that can change during the execution of a program.
变量为数据提供占位，使得其可以在程序运行时改变。
Change the experiment device to produce the same amount of hydrogen to control variables.
改变实验装置，通过产生相同量的氢气来重新控制变量。
Change the experiment device to produce the same amount of hydrogen to control variables.
改变实验装置，通过产生相同量的氢气来重新控制变量。
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