For example, the electric field or gravitational field is given by the gradient of the gravitational or electric potential.
例如由重力势梯度给出的重力场，或由电势梯度给出的电场。
Although the description of the system involves the electromagnetic potential, the physical properties only depend on the electric and magnetic field-strength.
结果表明，虽然对体系的描述涉及到电磁势，但体系的物理性质只依赖于电场和磁场的强度；
A variety of methods are employed to solve Poisson equation when discussing on the surface potential and surface electric field models of LDMOS with different structures in this paper.
在讨论不同结构的LDMOS表面势和表面电场模型时，本文采用多种方法求解泊松方程。
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