So, what that means concretely is if you have a forcefield that conservative, then you cannot build somehow some perpetual motion out of it.
具体来讲，如果你有一个保守力场，就不可能建立起永恒的运动。
2
Our main concern so far has been to say if we have a conservativeforcefield it means that the work of a force is the change in the energy.
目前为止，我们主要关心的是，如果在保守力场中，力所做的功是，能量的改变。
3
The article proceeds from the characteristic of doing work of electrostatic field strength and proves that electrostatic field is a conservativeforce field.