这些变量表示会随时间而变化的值。
These variables represent a value that can change over time.
下周我们从变量变化的观点，来看证明这个公式。
We will also see another proof of this formula, using changes of variables, next week.
若是变量的类型名称较长，或是会经常变化，那么这样的声明方法更是将显得非常乏味。
When the type names are long or are changed frequently, this can become quite tedious.
无法导致在状态或输出变量上的变化。
价值指数用以度量某些变量的价值总量变化。
A value index measures general changes in the total value of some variable.
永远记得考虑变量的变化。
并得出了损伤变量分别随应力和应变而变化的规律。
The evolutional law of damage variable as a function of stress was obtained.
如何改变一个视图的帧时，一个变量的值的变化？
How to change the frame of a view when a variable value changes?
实际上，环境因子应该是随时间变化的变量。
Actually, the environmental factor ought to be varying with testing time.
实际上，环境因子应该是随时间变化的变量。
Actually, the environmental factor ought to be varying with testing time.
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