And the electric conductivity of various temperature has been investigated, so that the activity energy is known as minusvalue with electric ion low dealt with.
还从研究不同温度下的电导而求得活化能，发现为负值，从中讨论了离子跃迁规律。
2
It is the value plus or minus something.
而是这个值加上或减去某个东西。
3
Well, if I have a gradient field, then if I try to compute this line integral, I know it will be the value of the function at the end point minus the value at the starting point.