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。

youdao

OK, so that's the general method of calculation, but we've seen a shortcut for work when we can show that the field is the gradient of potential.

这就是计算的一般方法，但求功的时候，如果向量场是某个势的梯度,是有捷径可走的。

youdao

So, actually on Tuesday we'll see how to decide whether a vector field is a gradient or not, and if it is a gradient, how to find the potential function.

周二我们就知道，怎样确定一个场是不是梯度，如果确实是梯度的话，怎样算出势函数。

youdao

So essentially, they regulate this action potential, and they do so by helping to establish and then control the voltage gradient within the cells.

总之本质上，它们负责调节动作电位,它们做到这一点通过协助制造,并控制细胞内的电位梯度。

麻省理工公开课 - 化学原理课程节选