So variable charge surface is not a constant potential surface.
所以，可变电荷表面并非恒电位表面。
Remember, in physics, the potential is defined up to adding or subtracting a constant.
注意，在物理学里面，势可以加上或者减去一个常数。
The basic function of a reference electrode is to maintain a constant electrical potential.
参比电极的基本功用是维持一个恒定的电能。
The basic function of a reference electrode is to maintain a constant electrical potential.
参比电极的基本功用是维持一个恒定的电能。
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