electric-charge density

例句：

1. 1.The electric charge density in the region is very high.
   该地区的电场电荷密度非常高。
2. 2. The electric charge density affects the behavior of electrons.
   电场电荷密度影响电子的行为。
3. 3. The electric charge density can be measured using a special device.
   可以通过一种特殊的设备测量电场电荷密度。