As a test charge moves closer to one of the fixed charges, the forces on it will be larger, thus the greater number of lines in that area.

随着电荷向其中一个固定电荷移， 身上的力量正增加。及行数。

In some dining halls, students pay directly for what they eat, while in others, they pay a fixed charge per term to cover catering overheads, and are then charged solely for the food they eat.

的餐厅里学生每学期交固定数额的餐饮管理费，然后再为所吃的食物单独付费。