例句與造句

1. In general, charge densities don't transform so simply between frames, because the spatial charge density and the temporal charge density ( i . e . current ) intermix in a transformation.
2. Since Torza treats the fluid inside the droplet and outside the droplet as having no net charge, the governing equation for the electric stress sub-problem reduces to Gauss Law with a spatial charge density of zero.
3. But in the frame in which the ( spatial ) charge density is at rest, the temporal charge density is zero, so there isn't an extra term in the transformation in that case to account for a temporal charge density in one frame contributing to the spatial charge density in the other frame.
4. It's difficult to find spatial charging in a sentence. 用spatial charging造句挺難的