There's no other place in space where all the lines go away from it,

力作用线不会随意的靠近或者远离
or go toward it. Everybody see that?

你们明白么
It's only at the charges that they all go away or all go toward.

它只会从电子出发到达另一个电子
And that has a very important meaning,

该现象具有非常重要的意义
that you can't have someplace off in free space

真空中不存在独立的区域
where all the lines of force would converge.

能聚集所有的力作用线
Notice if you were to have something that was positively charged,

带正电的物质
and it's at a minimum of energy,

具有最低能量
then any place you displace it,

若将正电荷转移至其它区域
it'll get pushed back, if it's at a lowest point in energy.

由于初始态能量最低它会自动返回
You push it any direction, it'll come back.

向任意方向转移它均自动返回
That is, all the lines of force must converge on that point.

即所有的力作用线均聚集于该点