点电荷的英文：
point charge

point是什么意思：
n. 点；标点；要点；尖端；得分
v. 削尖；指向；加标点于；表明

That is not the point in question.
那不是要考虑的要点。

orientation point
方位点

A score made on a try for a point or points after a touchdown.
触地得分在触地后再次发球所得的一分或几分

He explained the problem clearly by analyzing it point by point.
他条分缕析地把问题讲清楚。

concentrate troops at a strategic point
集中兵力于战略重点

charge是什么意思：
n. 费用；电荷；掌管；控告；命令，指示；指责
v. （使）充电；使承担；指责；装载；索价；向前冲；控告；把...记入帐册

charge the enemy
向敌人冲去

mileage charges
按英里程计算的运费

What is this charge for?
这项费用是什么？

Is there an extra charge?
有额外的费用吗？

The nucleus is formed of neutrons with no charge and protons with a positive charge
核子是由不带电荷的中子和带正电荷的质子形成的。