例句與造句

1. An important consequence of this is that theoretical calculations made for a Heaviside step function potential work perfectly well for potentials that have a finite spatial rate of change in potential : finite  " V over  " x, which is the case with physical situations, for e . g .-Quantum confinement systems of nano dots, etc.
2. It's difficult to find spatial rate in a sentence. 用spatial rate造句挺難的