external potential energy造句

例句与造句

1. Suppose some fixed, external potential energy U generates a conservative force F ( \ mathbf { x } ) =-\ nabla U ( \ mathbf { x } ) ( for example, an electric force ) on a particle located at a given position \ mathbf { x }.
2. It's difficult to find external potential energy in a sentence. 用external potential energy造句挺难的