The question is what does the curl of a force field mean?

问题是一个力场的旋度代表什么？

There is a force field around the arbitrary magnetic pole.

在任一个磁极的周围有一个力场。

It tells you that you cannot get energy for free out of your force field.

就意味着你不可能在力场里面无偿地得到能量。

We suggest to study a special kicked rotor moving in a piecewise continuous force field.

本论文建议研究一类特殊的分段连续力场中的受击转子。

The potential force field act mainly on model when contour curve close target region edges.

同时当轮廓曲线到目标区域附近时发挥梯度场较精确的优点。